fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_ACCESS:
 162                 return -EACCES;
 163         case -NFS4ERR_FILE_OPEN:
 164                 return -EBUSY;
 165         default:
 166                 dprintk("%s could not handle NFSv4 error %d\n",
 167                                 __func__, -err);
 168                 break;
 169         }
 170         return -EIO;
 171 }
 172
 173 /*
 174  * This is our standard bitmap for GETATTR requests.
 175  */
 176 const u32 nfs4_fattr_bitmap[3] = {
 177         FATTR4_WORD0_TYPE
 178         | FATTR4_WORD0_CHANGE
 179         | FATTR4_WORD0_SIZE
 180         | FATTR4_WORD0_FSID
 181         | FATTR4_WORD0_FILEID,
 182         FATTR4_WORD1_MODE
 183         | FATTR4_WORD1_NUMLINKS
 184         | FATTR4_WORD1_OWNER
 185         | FATTR4_WORD1_OWNER_GROUP
 186         | FATTR4_WORD1_RAWDEV
 187         | FATTR4_WORD1_SPACE_USED
 188         | FATTR4_WORD1_TIME_ACCESS
 189         | FATTR4_WORD1_TIME_METADATA
 190         | FATTR4_WORD1_TIME_MODIFY,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 318 {
 319         int res = 0;
 320
 321         might_sleep();
 322
 323         if (*timeout <= 0)
 324                 *timeout = NFS4_POLL_RETRY_MIN;
 325         if (*timeout > NFS4_POLL_RETRY_MAX)
 326                 *timeout = NFS4_POLL_RETRY_MAX;
 327         freezable_schedule_timeout_killable_unsafe(*timeout);
 328         if (fatal_signal_pending(current))
 329                 res = -ERESTARTSYS;
 330         *timeout <<= 1;
 331         return res;
 332 }
 333
 334 /* This is the error handling routine for processes that are allowed
 335  * to sleep.
 336  */
 337 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 338 {
 339         struct nfs_client *clp = server->nfs_client;
 340         struct nfs4_state *state = exception->state;
 341         struct inode *inode = exception->inode;
 342         int ret = errorcode;
 343
 344         exception->retry = 0;
 345         switch(errorcode) {
 346                 case 0:
 347                         return 0;
 348                 case -NFS4ERR_OPENMODE:
 349                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 350                                 nfs4_inode_return_delegation(inode);
 351                                 exception->retry = 1;
 352                                 return 0;
 353                         }
 354                         if (state == NULL)
 355                                 break;
 356                         ret = nfs4_schedule_stateid_recovery(server, state);
 357                         if (ret < 0)
 358                                 break;
 359                         goto wait_on_recovery;
 360                 case -NFS4ERR_DELEG_REVOKED:
 361                 case -NFS4ERR_ADMIN_REVOKED:
 362                 case -NFS4ERR_BAD_STATEID:
 363                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 364                                 nfs_remove_bad_delegation(inode);
 365                                 exception->retry = 1;
 366                                 break;
 367                         }
 368                         if (state == NULL)
 369                                 break;
 370                         ret = nfs4_schedule_stateid_recovery(server, state);
 371                         if (ret < 0)
 372                                 break;
 373                         goto wait_on_recovery;
 374                 case -NFS4ERR_EXPIRED:
 375                         if (state != NULL) {
 376                                 ret = nfs4_schedule_stateid_recovery(server, state);
 377                                 if (ret < 0)
 378                                         break;
 379                         }
 380                 case -NFS4ERR_STALE_STATEID:
 381                 case -NFS4ERR_STALE_CLIENTID:
 382                         nfs4_schedule_lease_recovery(clp);
 383                         goto wait_on_recovery;
 384                 case -NFS4ERR_MOVED:
 385                         ret = nfs4_schedule_migration_recovery(server);
 386                         if (ret < 0)
 387                                 break;
 388                         goto wait_on_recovery;
 389                 case -NFS4ERR_LEASE_MOVED:
 390                         nfs4_schedule_lease_moved_recovery(clp);
 391                         goto wait_on_recovery;
 392 #if defined(CONFIG_NFS_V4_1)
 393                 case -NFS4ERR_BADSESSION:
 394                 case -NFS4ERR_BADSLOT:
 395                 case -NFS4ERR_BAD_HIGH_SLOT:
 396                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 397                 case -NFS4ERR_DEADSESSION:
 398                 case -NFS4ERR_SEQ_FALSE_RETRY:
 399                 case -NFS4ERR_SEQ_MISORDERED:
 400                         dprintk("%s ERROR: %d Reset session\n", __func__,
 401                                 errorcode);
 402                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 403                         goto wait_on_recovery;
 404 #endif /* defined(CONFIG_NFS_V4_1) */
 405                 case -NFS4ERR_FILE_OPEN:
 406                         if (exception->timeout > HZ) {
 407                                 /* We have retried a decent amount, time to
 408                                  * fail
 409                                  */
 410                                 ret = -EBUSY;
 411                                 break;
 412                         }
 413                 case -NFS4ERR_GRACE:
 414                 case -NFS4ERR_DELAY:
 415                         ret = nfs4_delay(server->client, &exception->timeout);
 416                         if (ret != 0)
 417                                 break;
 418                 case -NFS4ERR_RETRY_UNCACHED_REP:
 419                 case -NFS4ERR_OLD_STATEID:
 420                         exception->retry = 1;
 421                         break;
 422                 case -NFS4ERR_BADOWNER:
 423                         /* The following works around a Linux server bug! */
 424                 case -NFS4ERR_BADNAME:
 425                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 426                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 427                                 exception->retry = 1;
 428                                 printk(KERN_WARNING "NFS: v4 server %s "
 429                                                 "does not accept raw "
 430                                                 "uid/gids. "
 431                                                 "Reenabling the idmapper.\n",
 432                                                 server->nfs_client->cl_hostname);
 433                         }
 434         }
 435         /* We failed to handle the error */
 436         return nfs4_map_errors(ret);
 437 wait_on_recovery:
 438         ret = nfs4_wait_clnt_recover(clp);
 439         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 440                 return -EIO;
 441         if (ret == 0)
 442                 exception->retry = 1;
 443         return ret;
 444 }
 445
 446 /*
 447  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 448  * or 'false' otherwise.
 449  */
 450 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 451 {
 452         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 453
 454         if (flavor == RPC_AUTH_GSS_KRB5I ||
 455             flavor == RPC_AUTH_GSS_KRB5P)
 456                 return true;
 457
 458         return false;
 459 }
 460
 461 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 462 {
 463         spin_lock(&clp->cl_lock);
 464         if (time_before(clp->cl_last_renewal,timestamp))
 465                 clp->cl_last_renewal = timestamp;
 466         spin_unlock(&clp->cl_lock);
 467 }
 468
 469 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 470 {
 471         do_renew_lease(server->nfs_client, timestamp);
 472 }
 473
 474 struct nfs4_call_sync_data {
 475         const struct nfs_server *seq_server;
 476         struct nfs4_sequence_args *seq_args;
 477         struct nfs4_sequence_res *seq_res;
 478 };
 479
 480 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 481                                struct nfs4_sequence_res *res, int cache_reply)
 482 {
 483         args->sa_slot = NULL;
 484         args->sa_cache_this = cache_reply;
 485         args->sa_privileged = 0;
 486
 487         res->sr_slot = NULL;
 488 }
 489
 490 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 491 {
 492         args->sa_privileged = 1;
 493 }
 494
 495 static int nfs40_setup_sequence(const struct nfs_server *server,
 496                                 struct nfs4_sequence_args *args,
 497                                 struct nfs4_sequence_res *res,
 498                                 struct rpc_task *task)
 499 {
 500         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 501         struct nfs4_slot *slot;
 502
 503         /* slot already allocated? */
 504         if (res->sr_slot != NULL)
 505                 goto out_start;
 506
 507         spin_lock(&tbl->slot_tbl_lock);
 508         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 509                 goto out_sleep;
 510
 511         slot = nfs4_alloc_slot(tbl);
 512         if (IS_ERR(slot)) {
 513                 if (slot == ERR_PTR(-ENOMEM))
 514                         task->tk_timeout = HZ >> 2;
 515                 goto out_sleep;
 516         }
 517         spin_unlock(&tbl->slot_tbl_lock);
 518
 519         args->sa_slot = slot;
 520         res->sr_slot = slot;
 521
 522 out_start:
 523         rpc_call_start(task);
 524         return 0;
 525
 526 out_sleep:
 527         if (args->sa_privileged)
 528                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 529                                 NULL, RPC_PRIORITY_PRIVILEGED);
 530         else
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532         spin_unlock(&tbl->slot_tbl_lock);
 533         return -EAGAIN;
 534 }
 535
 536 static int nfs40_sequence_done(struct rpc_task *task,
 537                                struct nfs4_sequence_res *res)
 538 {
 539         struct nfs4_slot *slot = res->sr_slot;
 540         struct nfs4_slot_table *tbl;
 541
 542         if (slot == NULL)
 543                 goto out;
 544
 545         tbl = slot->table;
 546         spin_lock(&tbl->slot_tbl_lock);
 547         if (!nfs41_wake_and_assign_slot(tbl, slot))
 548                 nfs4_free_slot(tbl, slot);
 549         spin_unlock(&tbl->slot_tbl_lock);
 550
 551         res->sr_slot = NULL;
 552 out:
 553         return 1;
 554 }
 555
 556 #if defined(CONFIG_NFS_V4_1)
 557
 558 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 559 {
 560         struct nfs4_session *session;
 561         struct nfs4_slot_table *tbl;
 562         struct nfs4_slot *slot = res->sr_slot;
 563         bool send_new_highest_used_slotid = false;
 564
 565         tbl = slot->table;
 566         session = tbl->session;
 567
 568         spin_lock(&tbl->slot_tbl_lock);
 569         /* Be nice to the server: try to ensure that the last transmitted
 570          * value for highest_user_slotid <= target_highest_slotid
 571          */
 572         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 573                 send_new_highest_used_slotid = true;
 574
 575         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 576                 send_new_highest_used_slotid = false;
 577                 goto out_unlock;
 578         }
 579         nfs4_free_slot(tbl, slot);
 580
 581         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 582                 send_new_highest_used_slotid = false;
 583 out_unlock:
 584         spin_unlock(&tbl->slot_tbl_lock);
 585         res->sr_slot = NULL;
 586         if (send_new_highest_used_slotid)
 587                 nfs41_server_notify_highest_slotid_update(session->clp);
 588 }
 589
 590 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 591 {
 592         struct nfs4_session *session;
 593         struct nfs4_slot *slot = res->sr_slot;
 594         struct nfs_client *clp;
 595         bool interrupted = false;
 596         int ret = 1;
 597
 598         if (slot == NULL)
 599                 goto out_noaction;
 600         /* don't increment the sequence number if the task wasn't sent */
 601         if (!RPC_WAS_SENT(task))
 602                 goto out;
 603
 604         session = slot->table->session;
 605
 606         if (slot->interrupted) {
 607                 slot->interrupted = 0;
 608                 interrupted = true;
 609         }
 610
 611         trace_nfs4_sequence_done(session, res);
 612         /* Check the SEQUENCE operation status */
 613         switch (res->sr_status) {
 614         case 0:
 615                 /* Update the slot's sequence and clientid lease timer */
 616                 ++slot->seq_nr;
 617                 clp = session->clp;
 618                 do_renew_lease(clp, res->sr_timestamp);
 619                 /* Check sequence flags */
 620                 if (res->sr_status_flags != 0)
 621                         nfs4_schedule_lease_recovery(clp);
 622                 nfs41_update_target_slotid(slot->table, slot, res);
 623                 break;
 624         case 1:
 625                 /*
 626                  * sr_status remains 1 if an RPC level error occurred.
 627                  * The server may or may not have processed the sequence
 628                  * operation..
 629                  * Mark the slot as having hosted an interrupted RPC call.
 630                  */
 631                 slot->interrupted = 1;
 632                 goto out;
 633         case -NFS4ERR_DELAY:
 634                 /* The server detected a resend of the RPC call and
 635                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 636                  * of RFC5661.
 637                  */
 638                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 639                         __func__,
 640                         slot->slot_nr,
 641                         slot->seq_nr);
 642                 goto out_retry;
 643         case -NFS4ERR_BADSLOT:
 644                 /*
 645                  * The slot id we used was probably retired. Try again
 646                  * using a different slot id.
 647                  */
 648                 goto retry_nowait;
 649         case -NFS4ERR_SEQ_MISORDERED:
 650                 /*
 651                  * Was the last operation on this sequence interrupted?
 652                  * If so, retry after bumping the sequence number.
 653                  */
 654                 if (interrupted) {
 655                         ++slot->seq_nr;
 656                         goto retry_nowait;
 657                 }
 658                 /*
 659                  * Could this slot have been previously retired?
 660                  * If so, then the server may be expecting seq_nr = 1!
 661                  */
 662                 if (slot->seq_nr != 1) {
 663                         slot->seq_nr = 1;
 664                         goto retry_nowait;
 665                 }
 666                 break;
 667         case -NFS4ERR_SEQ_FALSE_RETRY:
 668                 ++slot->seq_nr;
 669                 goto retry_nowait;
 670         default:
 671                 /* Just update the slot sequence no. */
 672                 ++slot->seq_nr;
 673         }
 674 out:
 675         /* The session may be reset by one of the error handlers. */
 676         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 677         nfs41_sequence_free_slot(res);
 678 out_noaction:
 679         return ret;
 680 retry_nowait:
 681         if (rpc_restart_call_prepare(task)) {
 682                 task->tk_status = 0;
 683                 ret = 0;
 684         }
 685         goto out;
 686 out_retry:
 687         if (!rpc_restart_call(task))
 688                 goto out;
 689         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 690         return 0;
 691 }
 692 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 693
 694 static int nfs4_sequence_done(struct rpc_task *task,
 695                                struct nfs4_sequence_res *res)
 696 {
 697         if (res->sr_slot == NULL)
 698                 return 1;
 699         if (!res->sr_slot->table->session)
 700                 return nfs40_sequence_done(task, res);
 701         return nfs41_sequence_done(task, res);
 702 }
 703
 704 int nfs41_setup_sequence(struct nfs4_session *session,
 705                                 struct nfs4_sequence_args *args,
 706                                 struct nfs4_sequence_res *res,
 707                                 struct rpc_task *task)
 708 {
 709         struct nfs4_slot *slot;
 710         struct nfs4_slot_table *tbl;
 711
 712         dprintk("--> %s\n", __func__);
 713         /* slot already allocated? */
 714         if (res->sr_slot != NULL)
 715                 goto out_success;
 716
 717         tbl = &session->fc_slot_table;
 718
 719         task->tk_timeout = 0;
 720
 721         spin_lock(&tbl->slot_tbl_lock);
 722         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 723             !args->sa_privileged) {
 724                 /* The state manager will wait until the slot table is empty */
 725                 dprintk("%s session is draining\n", __func__);
 726                 goto out_sleep;
 727         }
 728
 729         slot = nfs4_alloc_slot(tbl);
 730         if (IS_ERR(slot)) {
 731                 /* If out of memory, try again in 1/4 second */
 732                 if (slot == ERR_PTR(-ENOMEM))
 733                         task->tk_timeout = HZ >> 2;
 734                 dprintk("<-- %s: no free slots\n", __func__);
 735                 goto out_sleep;
 736         }
 737         spin_unlock(&tbl->slot_tbl_lock);
 738
 739         args->sa_slot = slot;
 740
 741         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 742                         slot->slot_nr, slot->seq_nr);
 743
 744         res->sr_slot = slot;
 745         res->sr_timestamp = jiffies;
 746         res->sr_status_flags = 0;
 747         /*
 748          * sr_status is only set in decode_sequence, and so will remain
 749          * set to 1 if an rpc level failure occurs.
 750          */
 751         res->sr_status = 1;
 752         trace_nfs4_setup_sequence(session, args);
 753 out_success:
 754         rpc_call_start(task);
 755         return 0;
 756 out_sleep:
 757         /* Privileged tasks are queued with top priority */
 758         if (args->sa_privileged)
 759                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 760                                 NULL, RPC_PRIORITY_PRIVILEGED);
 761         else
 762                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 763         spin_unlock(&tbl->slot_tbl_lock);
 764         return -EAGAIN;
 765 }
 766 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 767
 768 static int nfs4_setup_sequence(const struct nfs_server *server,
 769                                struct nfs4_sequence_args *args,
 770                                struct nfs4_sequence_res *res,
 771                                struct rpc_task *task)
 772 {
 773         struct nfs4_session *session = nfs4_get_session(server);
 774         int ret = 0;
 775
 776         if (!session)
 777                 return nfs40_setup_sequence(server, args, res, task);
 778
 779         dprintk("--> %s clp %p session %p sr_slot %u\n",
 780                 __func__, session->clp, session, res->sr_slot ?
 781                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 782
 783         ret = nfs41_setup_sequence(session, args, res, task);
 784
 785         dprintk("<-- %s status=%d\n", __func__, ret);
 786         return ret;
 787 }
 788
 789 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 790 {
 791         struct nfs4_call_sync_data *data = calldata;
 792         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 793
 794         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 795
 796         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 797 }
 798
 799 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_call_sync_data *data = calldata;
 802
 803         nfs41_sequence_done(task, data->seq_res);
 804 }
 805
 806 static const struct rpc_call_ops nfs41_call_sync_ops = {
 807         .rpc_call_prepare = nfs41_call_sync_prepare,
 808         .rpc_call_done = nfs41_call_sync_done,
 809 };
 810
 811 #else   /* !CONFIG_NFS_V4_1 */
 812
 813 static int nfs4_setup_sequence(const struct nfs_server *server,
 814                                struct nfs4_sequence_args *args,
 815                                struct nfs4_sequence_res *res,
 816                                struct rpc_task *task)
 817 {
 818         return nfs40_setup_sequence(server, args, res, task);
 819 }
 820
 821 static int nfs4_sequence_done(struct rpc_task *task,
 822                                struct nfs4_sequence_res *res)
 823 {
 824         return nfs40_sequence_done(task, res);
 825 }
 826
 827 #endif  /* !CONFIG_NFS_V4_1 */
 828
 829 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 830 {
 831         struct nfs4_call_sync_data *data = calldata;
 832         nfs4_setup_sequence(data->seq_server,
 833                                 data->seq_args, data->seq_res, task);
 834 }
 835
 836 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 837 {
 838         struct nfs4_call_sync_data *data = calldata;
 839         nfs4_sequence_done(task, data->seq_res);
 840 }
 841
 842 static const struct rpc_call_ops nfs40_call_sync_ops = {
 843         .rpc_call_prepare = nfs40_call_sync_prepare,
 844         .rpc_call_done = nfs40_call_sync_done,
 845 };
 846
 847 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 848                                    struct nfs_server *server,
 849                                    struct rpc_message *msg,
 850                                    struct nfs4_sequence_args *args,
 851                                    struct nfs4_sequence_res *res)
 852 {
 853         int ret;
 854         struct rpc_task *task;
 855         struct nfs_client *clp = server->nfs_client;
 856         struct nfs4_call_sync_data data = {
 857                 .seq_server = server,
 858                 .seq_args = args,
 859                 .seq_res = res,
 860         };
 861         struct rpc_task_setup task_setup = {
 862                 .rpc_client = clnt,
 863                 .rpc_message = msg,
 864                 .callback_ops = clp->cl_mvops->call_sync_ops,
 865                 .callback_data = &data
 866         };
 867
 868         task = rpc_run_task(&task_setup);
 869         if (IS_ERR(task))
 870                 ret = PTR_ERR(task);
 871         else {
 872                 ret = task->tk_status;
 873                 rpc_put_task(task);
 874         }
 875         return ret;
 876 }
 877
 878 static
 879 int nfs4_call_sync(struct rpc_clnt *clnt,
 880                    struct nfs_server *server,
 881                    struct rpc_message *msg,
 882                    struct nfs4_sequence_args *args,
 883                    struct nfs4_sequence_res *res,
 884                    int cache_reply)
 885 {
 886         nfs4_init_sequence(args, res, cache_reply);
 887         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 888 }
 889
 890 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 891 {
 892         struct nfs_inode *nfsi = NFS_I(dir);
 893
 894         spin_lock(&dir->i_lock);
 895         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 896         if (!cinfo->atomic || cinfo->before != dir->i_version)
 897                 nfs_force_lookup_revalidate(dir);
 898         dir->i_version = cinfo->after;
 899         nfs_fscache_invalidate(dir);
 900         spin_unlock(&dir->i_lock);
 901 }
 902
 903 struct nfs4_opendata {
 904         struct kref kref;
 905         struct nfs_openargs o_arg;
 906         struct nfs_openres o_res;
 907         struct nfs_open_confirmargs c_arg;
 908         struct nfs_open_confirmres c_res;
 909         struct nfs4_string owner_name;
 910         struct nfs4_string group_name;
 911         struct nfs_fattr f_attr;
 912         struct nfs4_label *f_label;
 913         struct dentry *dir;
 914         struct dentry *dentry;
 915         struct nfs4_state_owner *owner;
 916         struct nfs4_state *state;
 917         struct iattr attrs;
 918         unsigned long timestamp;
 919         unsigned int rpc_done : 1;
 920         unsigned int file_created : 1;
 921         unsigned int is_recover : 1;
 922         int rpc_status;
 923         int cancelled;
 924 };
 925
 926 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 927                 int err, struct nfs4_exception *exception)
 928 {
 929         if (err != -EINVAL)
 930                 return false;
 931         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 932                 return false;
 933         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 934         exception->retry = 1;
 935         return true;
 936 }
 937
 938 static enum open_claim_type4
 939 nfs4_map_atomic_open_claim(struct nfs_server *server,
 940                 enum open_claim_type4 claim)
 941 {
 942         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 943                 return claim;
 944         switch (claim) {
 945         default:
 946                 return claim;
 947         case NFS4_OPEN_CLAIM_FH:
 948                 return NFS4_OPEN_CLAIM_NULL;
 949         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 950                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 951         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 952                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 953         }
 954 }
 955
 956 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 957 {
 958         p->o_res.f_attr = &p->f_attr;
 959         p->o_res.f_label = p->f_label;
 960         p->o_res.seqid = p->o_arg.seqid;
 961         p->c_res.seqid = p->c_arg.seqid;
 962         p->o_res.server = p->o_arg.server;
 963         p->o_res.access_request = p->o_arg.access;
 964         nfs_fattr_init(&p->f_attr);
 965         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 966 }
 967
 968 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 969                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 970                 const struct iattr *attrs,
 971                 struct nfs4_label *label,
 972                 enum open_claim_type4 claim,
 973                 gfp_t gfp_mask)
 974 {
 975         struct dentry *parent = dget_parent(dentry);
 976         struct inode *dir = parent->d_inode;
 977         struct nfs_server *server = NFS_SERVER(dir);
 978         struct nfs4_opendata *p;
 979
 980         p = kzalloc(sizeof(*p), gfp_mask);
 981         if (p == NULL)
 982                 goto err;
 983
 984         p->f_label = nfs4_label_alloc(server, gfp_mask);
 985         if (IS_ERR(p->f_label))
 986                 goto err_free_p;
 987
 988         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 989         if (p->o_arg.seqid == NULL)
 990                 goto err_free_label;
 991         nfs_sb_active(dentry->d_sb);
 992         p->dentry = dget(dentry);
 993         p->dir = parent;
 994         p->owner = sp;
 995         atomic_inc(&sp->so_count);
 996         p->o_arg.open_flags = flags;
 997         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 998         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 999          * will return permission denied for all bits until close */
1000         if (!(flags & O_EXCL)) {
1001                 /* ask server to check for all possible rights as results
1002                  * are cached */
1003                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1004                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1005         }
1006         p->o_arg.clientid = server->nfs_client->cl_clientid;
1007         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1008         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1009         p->o_arg.name = &dentry->d_name;
1010         p->o_arg.server = server;
1011         p->o_arg.bitmask = nfs4_bitmask(server, label);
1012         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1013         p->o_arg.label = label;
1014         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1015         switch (p->o_arg.claim) {
1016         case NFS4_OPEN_CLAIM_NULL:
1017         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1018         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1019                 p->o_arg.fh = NFS_FH(dir);
1020                 break;
1021         case NFS4_OPEN_CLAIM_PREVIOUS:
1022         case NFS4_OPEN_CLAIM_FH:
1023         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1024         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1025                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1026         }
1027         if (attrs != NULL && attrs->ia_valid != 0) {
1028                 __u32 verf[2];
1029
1030                 p->o_arg.u.attrs = &p->attrs;
1031                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1032
1033                 verf[0] = jiffies;
1034                 verf[1] = current->pid;
1035                 memcpy(p->o_arg.u.verifier.data, verf,
1036                                 sizeof(p->o_arg.u.verifier.data));
1037         }
1038         p->c_arg.fh = &p->o_res.fh;
1039         p->c_arg.stateid = &p->o_res.stateid;
1040         p->c_arg.seqid = p->o_arg.seqid;
1041         nfs4_init_opendata_res(p);
1042         kref_init(&p->kref);
1043         return p;
1044
1045 err_free_label:
1046         nfs4_label_free(p->f_label);
1047 err_free_p:
1048         kfree(p);
1049 err:
1050         dput(parent);
1051         return NULL;
1052 }
1053
1054 static void nfs4_opendata_free(struct kref *kref)
1055 {
1056         struct nfs4_opendata *p = container_of(kref,
1057                         struct nfs4_opendata, kref);
1058         struct super_block *sb = p->dentry->d_sb;
1059
1060         nfs_free_seqid(p->o_arg.seqid);
1061         if (p->state != NULL)
1062                 nfs4_put_open_state(p->state);
1063         nfs4_put_state_owner(p->owner);
1064
1065         nfs4_label_free(p->f_label);
1066
1067         dput(p->dir);
1068         dput(p->dentry);
1069         nfs_sb_deactive(sb);
1070         nfs_fattr_free_names(&p->f_attr);
1071         kfree(p->f_attr.mdsthreshold);
1072         kfree(p);
1073 }
1074
1075 static void nfs4_opendata_put(struct nfs4_opendata *p)
1076 {
1077         if (p != NULL)
1078                 kref_put(&p->kref, nfs4_opendata_free);
1079 }
1080
1081 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1082 {
1083         int ret;
1084
1085         ret = rpc_wait_for_completion_task(task);
1086         return ret;
1087 }
1088
1089 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1090 {
1091         int ret = 0;
1092
1093         if (open_mode & (O_EXCL|O_TRUNC))
1094                 goto out;
1095         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1096                 case FMODE_READ:
1097                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1098                                 && state->n_rdonly != 0;
1099                         break;
1100                 case FMODE_WRITE:
1101                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1102                                 && state->n_wronly != 0;
1103                         break;
1104                 case FMODE_READ|FMODE_WRITE:
1105                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1106                                 && state->n_rdwr != 0;
1107         }
1108 out:
1109         return ret;
1110 }
1111
1112 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1113 {
1114         if (delegation == NULL)
1115                 return 0;
1116         if ((delegation->type & fmode) != fmode)
1117                 return 0;
1118         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1119                 return 0;
1120         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1121                 return 0;
1122         nfs_mark_delegation_referenced(delegation);
1123         return 1;
1124 }
1125
1126 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1127 {
1128         switch (fmode) {
1129                 case FMODE_WRITE:
1130                         state->n_wronly++;
1131                         break;
1132                 case FMODE_READ:
1133                         state->n_rdonly++;
1134                         break;
1135                 case FMODE_READ|FMODE_WRITE:
1136                         state->n_rdwr++;
1137         }
1138         nfs4_state_set_mode_locked(state, state->state | fmode);
1139 }
1140
1141 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1142 {
1143         struct nfs_client *clp = state->owner->so_server->nfs_client;
1144         bool need_recover = false;
1145
1146         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1147                 need_recover = true;
1148         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1149                 need_recover = true;
1150         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1151                 need_recover = true;
1152         if (need_recover)
1153                 nfs4_state_mark_reclaim_nograce(clp, state);
1154 }
1155
1156 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1157                 nfs4_stateid *stateid)
1158 {
1159         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1160                 return true;
1161         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1162                 nfs_test_and_clear_all_open_stateid(state);
1163                 return true;
1164         }
1165         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1166                 return true;
1167         return false;
1168 }
1169
1170 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1171                 nfs4_stateid *stateid, fmode_t fmode)
1172 {
1173         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1174         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1175         case FMODE_WRITE:
1176                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1177                 break;
1178         case FMODE_READ:
1179                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1180                 break;
1181         case 0:
1182                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1183                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1184                 clear_bit(NFS_OPEN_STATE, &state->flags);
1185         }
1186         if (stateid == NULL)
1187                 return;
1188         if (!nfs_need_update_open_stateid(state, stateid))
1189                 return;
1190         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1191                 nfs4_stateid_copy(&state->stateid, stateid);
1192         nfs4_stateid_copy(&state->open_stateid, stateid);
1193 }
1194
1195 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1196 {
1197         write_seqlock(&state->seqlock);
1198         nfs_clear_open_stateid_locked(state, stateid, fmode);
1199         write_sequnlock(&state->seqlock);
1200         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1201                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1202 }
1203
1204 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1205 {
1206         switch (fmode) {
1207                 case FMODE_READ:
1208                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1209                         break;
1210                 case FMODE_WRITE:
1211                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1212                         break;
1213                 case FMODE_READ|FMODE_WRITE:
1214                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1215         }
1216         if (!nfs_need_update_open_stateid(state, stateid))
1217                 return;
1218         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1219                 nfs4_stateid_copy(&state->stateid, stateid);
1220         nfs4_stateid_copy(&state->open_stateid, stateid);
1221 }
1222
1223 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1224 {
1225         /*
1226          * Protect the call to nfs4_state_set_mode_locked and
1227          * serialise the stateid update
1228          */
1229         write_seqlock(&state->seqlock);
1230         if (deleg_stateid != NULL) {
1231                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1232                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1233         }
1234         if (open_stateid != NULL)
1235                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1236         write_sequnlock(&state->seqlock);
1237         spin_lock(&state->owner->so_lock);
1238         update_open_stateflags(state, fmode);
1239         spin_unlock(&state->owner->so_lock);
1240 }
1241
1242 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1243 {
1244         struct nfs_inode *nfsi = NFS_I(state->inode);
1245         struct nfs_delegation *deleg_cur;
1246         int ret = 0;
1247
1248         fmode &= (FMODE_READ|FMODE_WRITE);
1249
1250         rcu_read_lock();
1251         deleg_cur = rcu_dereference(nfsi->delegation);
1252         if (deleg_cur == NULL)
1253                 goto no_delegation;
1254
1255         spin_lock(&deleg_cur->lock);
1256         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1257            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1258             (deleg_cur->type & fmode) != fmode)
1259                 goto no_delegation_unlock;
1260
1261         if (delegation == NULL)
1262                 delegation = &deleg_cur->stateid;
1263         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1264                 goto no_delegation_unlock;
1265
1266         nfs_mark_delegation_referenced(deleg_cur);
1267         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1268         ret = 1;
1269 no_delegation_unlock:
1270         spin_unlock(&deleg_cur->lock);
1271 no_delegation:
1272         rcu_read_unlock();
1273
1274         if (!ret && open_stateid != NULL) {
1275                 __update_open_stateid(state, open_stateid, NULL, fmode);
1276                 ret = 1;
1277         }
1278         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1279                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1280
1281         return ret;
1282 }
1283
1284
1285 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1286 {
1287         struct nfs_delegation *delegation;
1288
1289         rcu_read_lock();
1290         delegation = rcu_dereference(NFS_I(inode)->delegation);
1291         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1292                 rcu_read_unlock();
1293                 return;
1294         }
1295         rcu_read_unlock();
1296         nfs4_inode_return_delegation(inode);
1297 }
1298
1299 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1300 {
1301         struct nfs4_state *state = opendata->state;
1302         struct nfs_inode *nfsi = NFS_I(state->inode);
1303         struct nfs_delegation *delegation;
1304         int open_mode = opendata->o_arg.open_flags;
1305         fmode_t fmode = opendata->o_arg.fmode;
1306         nfs4_stateid stateid;
1307         int ret = -EAGAIN;
1308
1309         for (;;) {
1310                 if (can_open_cached(state, fmode, open_mode)) {
1311                         spin_lock(&state->owner->so_lock);
1312                         if (can_open_cached(state, fmode, open_mode)) {
1313                                 update_open_stateflags(state, fmode);
1314                                 spin_unlock(&state->owner->so_lock);
1315                                 goto out_return_state;
1316                         }
1317                         spin_unlock(&state->owner->so_lock);
1318                 }
1319                 rcu_read_lock();
1320                 delegation = rcu_dereference(nfsi->delegation);
1321                 if (!can_open_delegated(delegation, fmode)) {
1322                         rcu_read_unlock();
1323                         break;
1324                 }
1325                 /* Save the delegation */
1326                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1327                 rcu_read_unlock();
1328                 nfs_release_seqid(opendata->o_arg.seqid);
1329                 if (!opendata->is_recover) {
1330                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1331                         if (ret != 0)
1332                                 goto out;
1333                 }
1334                 ret = -EAGAIN;
1335
1336                 /* Try to update the stateid using the delegation */
1337                 if (update_open_stateid(state, NULL, &stateid, fmode))
1338                         goto out_return_state;
1339         }
1340 out:
1341         return ERR_PTR(ret);
1342 out_return_state:
1343         atomic_inc(&state->count);
1344         return state;
1345 }
1346
1347 static void
1348 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1349 {
1350         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1351         struct nfs_delegation *delegation;
1352         int delegation_flags = 0;
1353
1354         rcu_read_lock();
1355         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1356         if (delegation)
1357                 delegation_flags = delegation->flags;
1358         rcu_read_unlock();
1359         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1360                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1361                                    "returning a delegation for "
1362                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1363                                    clp->cl_hostname);
1364         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1365                 nfs_inode_set_delegation(state->inode,
1366                                          data->owner->so_cred,
1367                                          &data->o_res);
1368         else
1369                 nfs_inode_reclaim_delegation(state->inode,
1370                                              data->owner->so_cred,
1371                                              &data->o_res);
1372 }
1373
1374 /*
1375  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1376  * and update the nfs4_state.
1377  */
1378 static struct nfs4_state *
1379 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1380 {
1381         struct inode *inode = data->state->inode;
1382         struct nfs4_state *state = data->state;
1383         int ret;
1384
1385         if (!data->rpc_done) {
1386                 if (data->rpc_status) {
1387                         ret = data->rpc_status;
1388                         goto err;
1389                 }
1390                 /* cached opens have already been processed */
1391                 goto update;
1392         }
1393
1394         ret = nfs_refresh_inode(inode, &data->f_attr);
1395         if (ret)
1396                 goto err;
1397
1398         if (data->o_res.delegation_type != 0)
1399                 nfs4_opendata_check_deleg(data, state);
1400 update:
1401         update_open_stateid(state, &data->o_res.stateid, NULL,
1402                             data->o_arg.fmode);
1403         atomic_inc(&state->count);
1404
1405         return state;
1406 err:
1407         return ERR_PTR(ret);
1408
1409 }
1410
1411 static struct nfs4_state *
1412 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1413 {
1414         struct inode *inode;
1415         struct nfs4_state *state = NULL;
1416         int ret;
1417
1418         if (!data->rpc_done) {
1419                 state = nfs4_try_open_cached(data);
1420                 goto out;
1421         }
1422
1423         ret = -EAGAIN;
1424         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1425                 goto err;
1426         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1427         ret = PTR_ERR(inode);
1428         if (IS_ERR(inode))
1429                 goto err;
1430         ret = -ENOMEM;
1431         state = nfs4_get_open_state(inode, data->owner);
1432         if (state == NULL)
1433                 goto err_put_inode;
1434         if (data->o_res.delegation_type != 0)
1435                 nfs4_opendata_check_deleg(data, state);
1436         update_open_stateid(state, &data->o_res.stateid, NULL,
1437                         data->o_arg.fmode);
1438         iput(inode);
1439 out:
1440         nfs_release_seqid(data->o_arg.seqid);
1441         return state;
1442 err_put_inode:
1443         iput(inode);
1444 err:
1445         return ERR_PTR(ret);
1446 }
1447
1448 static struct nfs4_state *
1449 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1450 {
1451         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1452                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1453         return _nfs4_opendata_to_nfs4_state(data);
1454 }
1455
1456 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1457 {
1458         struct nfs_inode *nfsi = NFS_I(state->inode);
1459         struct nfs_open_context *ctx;
1460
1461         spin_lock(&state->inode->i_lock);
1462         list_for_each_entry(ctx, &nfsi->open_files, list) {
1463                 if (ctx->state != state)
1464                         continue;
1465                 get_nfs_open_context(ctx);
1466                 spin_unlock(&state->inode->i_lock);
1467                 return ctx;
1468         }
1469         spin_unlock(&state->inode->i_lock);
1470         return ERR_PTR(-ENOENT);
1471 }
1472
1473 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1474                 struct nfs4_state *state, enum open_claim_type4 claim)
1475 {
1476         struct nfs4_opendata *opendata;
1477
1478         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1479                         NULL, NULL, claim, GFP_NOFS);
1480         if (opendata == NULL)
1481                 return ERR_PTR(-ENOMEM);
1482         opendata->state = state;
1483         atomic_inc(&state->count);
1484         return opendata;
1485 }
1486
1487 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1488 {
1489         struct nfs4_state *newstate;
1490         int ret;
1491
1492         opendata->o_arg.open_flags = 0;
1493         opendata->o_arg.fmode = fmode;
1494         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1495         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1496         nfs4_init_opendata_res(opendata);
1497         ret = _nfs4_recover_proc_open(opendata);
1498         if (ret != 0)
1499                 return ret;
1500         newstate = nfs4_opendata_to_nfs4_state(opendata);
1501         if (IS_ERR(newstate))
1502                 return PTR_ERR(newstate);
1503         nfs4_close_state(newstate, fmode);
1504         *res = newstate;
1505         return 0;
1506 }
1507
1508 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1509 {
1510         struct nfs4_state *newstate;
1511         int ret;
1512
1513         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1514         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1515         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1516         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1517         /* memory barrier prior to reading state->n_* */
1518         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1519         clear_bit(NFS_OPEN_STATE, &state->flags);
1520         smp_rmb();
1521         if (state->n_rdwr != 0) {
1522                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1523                 if (ret != 0)
1524                         return ret;
1525                 if (newstate != state)
1526                         return -ESTALE;
1527         }
1528         if (state->n_wronly != 0) {
1529                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1530                 if (ret != 0)
1531                         return ret;
1532                 if (newstate != state)
1533                         return -ESTALE;
1534         }
1535         if (state->n_rdonly != 0) {
1536                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1537                 if (ret != 0)
1538                         return ret;
1539                 if (newstate != state)
1540                         return -ESTALE;
1541         }
1542         /*
1543          * We may have performed cached opens for all three recoveries.
1544          * Check if we need to update the current stateid.
1545          */
1546         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1547             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1548                 write_seqlock(&state->seqlock);
1549                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1550                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1551                 write_sequnlock(&state->seqlock);
1552         }
1553         return 0;
1554 }
1555
1556 /*
1557  * OPEN_RECLAIM:
1558  *      reclaim state on the server after a reboot.
1559  */
1560 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1561 {
1562         struct nfs_delegation *delegation;
1563         struct nfs4_opendata *opendata;
1564         fmode_t delegation_type = 0;
1565         int status;
1566
1567         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1568                         NFS4_OPEN_CLAIM_PREVIOUS);
1569         if (IS_ERR(opendata))
1570                 return PTR_ERR(opendata);
1571         rcu_read_lock();
1572         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1573         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1574                 delegation_type = delegation->type;
1575         rcu_read_unlock();
1576         opendata->o_arg.u.delegation_type = delegation_type;
1577         status = nfs4_open_recover(opendata, state);
1578         nfs4_opendata_put(opendata);
1579         return status;
1580 }
1581
1582 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1583 {
1584         struct nfs_server *server = NFS_SERVER(state->inode);
1585         struct nfs4_exception exception = { };
1586         int err;
1587         do {
1588                 err = _nfs4_do_open_reclaim(ctx, state);
1589                 trace_nfs4_open_reclaim(ctx, 0, err);
1590                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1591                         continue;
1592                 if (err != -NFS4ERR_DELAY)
1593                         break;
1594                 nfs4_handle_exception(server, err, &exception);
1595         } while (exception.retry);
1596         return err;
1597 }
1598
1599 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1600 {
1601         struct nfs_open_context *ctx;
1602         int ret;
1603
1604         ctx = nfs4_state_find_open_context(state);
1605         if (IS_ERR(ctx))
1606                 return -EAGAIN;
1607         ret = nfs4_do_open_reclaim(ctx, state);
1608         put_nfs_open_context(ctx);
1609         return ret;
1610 }
1611
1612 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1613 {
1614         switch (err) {
1615                 default:
1616                         printk(KERN_ERR "NFS: %s: unhandled error "
1617                                         "%d.\n", __func__, err);
1618                 case 0:
1619                 case -ENOENT:
1620                 case -ESTALE:
1621                         break;
1622                 case -NFS4ERR_BADSESSION:
1623                 case -NFS4ERR_BADSLOT:
1624                 case -NFS4ERR_BAD_HIGH_SLOT:
1625                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1626                 case -NFS4ERR_DEADSESSION:
1627                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1628                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1629                         return -EAGAIN;
1630                 case -NFS4ERR_STALE_CLIENTID:
1631                 case -NFS4ERR_STALE_STATEID:
1632                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1633                 case -NFS4ERR_EXPIRED:
1634                         /* Don't recall a delegation if it was lost */
1635                         nfs4_schedule_lease_recovery(server->nfs_client);
1636                         return -EAGAIN;
1637                 case -NFS4ERR_MOVED:
1638                         nfs4_schedule_migration_recovery(server);
1639                         return -EAGAIN;
1640                 case -NFS4ERR_LEASE_MOVED:
1641                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1642                         return -EAGAIN;
1643                 case -NFS4ERR_DELEG_REVOKED:
1644                 case -NFS4ERR_ADMIN_REVOKED:
1645                 case -NFS4ERR_BAD_STATEID:
1646                 case -NFS4ERR_OPENMODE:
1647                         nfs_inode_find_state_and_recover(state->inode,
1648                                         stateid);
1649                         nfs4_schedule_stateid_recovery(server, state);
1650                         return 0;
1651                 case -NFS4ERR_DELAY:
1652                 case -NFS4ERR_GRACE:
1653                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1654                         ssleep(1);
1655                         return -EAGAIN;
1656                 case -ENOMEM:
1657                 case -NFS4ERR_DENIED:
1658                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1659                         return 0;
1660         }
1661         return err;
1662 }
1663
1664 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1665 {
1666         struct nfs_server *server = NFS_SERVER(state->inode);
1667         struct nfs4_opendata *opendata;
1668         int err;
1669
1670         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1671                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1672         if (IS_ERR(opendata))
1673                 return PTR_ERR(opendata);
1674         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1675         err = nfs4_open_recover(opendata, state);
1676         nfs4_opendata_put(opendata);
1677         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1678 }
1679
1680 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1681 {
1682         struct nfs4_opendata *data = calldata;
1683
1684         nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1685                                 &data->c_res.seq_res, task);
1686 }
1687
1688 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1689 {
1690         struct nfs4_opendata *data = calldata;
1691
1692         nfs40_sequence_done(task, &data->c_res.seq_res);
1693
1694         data->rpc_status = task->tk_status;
1695         if (data->rpc_status == 0) {
1696                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1697                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1698                 renew_lease(data->o_res.server, data->timestamp);
1699                 data->rpc_done = 1;
1700         }
1701 }
1702
1703 static void nfs4_open_confirm_release(void *calldata)
1704 {
1705         struct nfs4_opendata *data = calldata;
1706         struct nfs4_state *state = NULL;
1707
1708         /* If this request hasn't been cancelled, do nothing */
1709         if (data->cancelled == 0)
1710                 goto out_free;
1711         /* In case of error, no cleanup! */
1712         if (!data->rpc_done)
1713                 goto out_free;
1714         state = nfs4_opendata_to_nfs4_state(data);
1715         if (!IS_ERR(state))
1716                 nfs4_close_state(state, data->o_arg.fmode);
1717 out_free:
1718         nfs4_opendata_put(data);
1719 }
1720
1721 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1722         .rpc_call_prepare = nfs4_open_confirm_prepare,
1723         .rpc_call_done = nfs4_open_confirm_done,
1724         .rpc_release = nfs4_open_confirm_release,
1725 };
1726
1727 /*
1728  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1729  */
1730 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1731 {
1732         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1733         struct rpc_task *task;
1734         struct  rpc_message msg = {
1735                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1736                 .rpc_argp = &data->c_arg,
1737                 .rpc_resp = &data->c_res,
1738                 .rpc_cred = data->owner->so_cred,
1739         };
1740         struct rpc_task_setup task_setup_data = {
1741                 .rpc_client = server->client,
1742                 .rpc_message = &msg,
1743                 .callback_ops = &nfs4_open_confirm_ops,
1744                 .callback_data = data,
1745                 .workqueue = nfsiod_workqueue,
1746                 .flags = RPC_TASK_ASYNC,
1747         };
1748         int status;
1749
1750         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1751         kref_get(&data->kref);
1752         data->rpc_done = 0;
1753         data->rpc_status = 0;
1754         data->timestamp = jiffies;
1755         task = rpc_run_task(&task_setup_data);
1756         if (IS_ERR(task))
1757                 return PTR_ERR(task);
1758         status = nfs4_wait_for_completion_rpc_task(task);
1759         if (status != 0) {
1760                 data->cancelled = 1;
1761                 smp_wmb();
1762         } else
1763                 status = data->rpc_status;
1764         rpc_put_task(task);
1765         return status;
1766 }
1767
1768 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1769 {
1770         struct nfs4_opendata *data = calldata;
1771         struct nfs4_state_owner *sp = data->owner;
1772         struct nfs_client *clp = sp->so_server->nfs_client;
1773
1774         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1775                 goto out_wait;
1776         /*
1777          * Check if we still need to send an OPEN call, or if we can use
1778          * a delegation instead.
1779          */
1780         if (data->state != NULL) {
1781                 struct nfs_delegation *delegation;
1782
1783                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1784                         goto out_no_action;
1785                 rcu_read_lock();
1786                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1787                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1788                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1789                     can_open_delegated(delegation, data->o_arg.fmode))
1790                         goto unlock_no_action;
1791                 rcu_read_unlock();
1792         }
1793         /* Update client id. */
1794         data->o_arg.clientid = clp->cl_clientid;
1795         switch (data->o_arg.claim) {
1796         case NFS4_OPEN_CLAIM_PREVIOUS:
1797         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1798         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1799                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1800         case NFS4_OPEN_CLAIM_FH:
1801                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1802                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1803         }
1804         data->timestamp = jiffies;
1805         if (nfs4_setup_sequence(data->o_arg.server,
1806                                 &data->o_arg.seq_args,
1807                                 &data->o_res.seq_res,
1808                                 task) != 0)
1809                 nfs_release_seqid(data->o_arg.seqid);
1810
1811         /* Set the create mode (note dependency on the session type) */
1812         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1813         if (data->o_arg.open_flags & O_EXCL) {
1814                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1815                 if (nfs4_has_persistent_session(clp))
1816                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1817                 else if (clp->cl_mvops->minor_version > 0)
1818                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1819         }
1820         return;
1821 unlock_no_action:
1822         rcu_read_unlock();
1823 out_no_action:
1824         task->tk_action = NULL;
1825 out_wait:
1826         nfs4_sequence_done(task, &data->o_res.seq_res);
1827 }
1828
1829 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1830 {
1831         struct nfs4_opendata *data = calldata;
1832
1833         data->rpc_status = task->tk_status;
1834
1835         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1836                 return;
1837
1838         if (task->tk_status == 0) {
1839                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1840                         switch (data->o_res.f_attr->mode & S_IFMT) {
1841                         case S_IFREG:
1842                                 break;
1843                         case S_IFLNK:
1844                                 data->rpc_status = -ELOOP;
1845                                 break;
1846                         case S_IFDIR:
1847                                 data->rpc_status = -EISDIR;
1848                                 break;
1849                         default:
1850                                 data->rpc_status = -ENOTDIR;
1851                         }
1852                 }
1853                 renew_lease(data->o_res.server, data->timestamp);
1854                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1855                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1856         }
1857         data->rpc_done = 1;
1858 }
1859
1860 static void nfs4_open_release(void *calldata)
1861 {
1862         struct nfs4_opendata *data = calldata;
1863         struct nfs4_state *state = NULL;
1864
1865         /* If this request hasn't been cancelled, do nothing */
1866         if (data->cancelled == 0)
1867                 goto out_free;
1868         /* In case of error, no cleanup! */
1869         if (data->rpc_status != 0 || !data->rpc_done)
1870                 goto out_free;
1871         /* In case we need an open_confirm, no cleanup! */
1872         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1873                 goto out_free;
1874         state = nfs4_opendata_to_nfs4_state(data);
1875         if (!IS_ERR(state))
1876                 nfs4_close_state(state, data->o_arg.fmode);
1877 out_free:
1878         nfs4_opendata_put(data);
1879 }
1880
1881 static const struct rpc_call_ops nfs4_open_ops = {
1882         .rpc_call_prepare = nfs4_open_prepare,
1883         .rpc_call_done = nfs4_open_done,
1884         .rpc_release = nfs4_open_release,
1885 };
1886
1887 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1888 {
1889         struct inode *dir = data->dir->d_inode;
1890         struct nfs_server *server = NFS_SERVER(dir);
1891         struct nfs_openargs *o_arg = &data->o_arg;
1892         struct nfs_openres *o_res = &data->o_res;
1893         struct rpc_task *task;
1894         struct rpc_message msg = {
1895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1896                 .rpc_argp = o_arg,
1897                 .rpc_resp = o_res,
1898                 .rpc_cred = data->owner->so_cred,
1899         };
1900         struct rpc_task_setup task_setup_data = {
1901                 .rpc_client = server->client,
1902                 .rpc_message = &msg,
1903                 .callback_ops = &nfs4_open_ops,
1904                 .callback_data = data,
1905                 .workqueue = nfsiod_workqueue,
1906                 .flags = RPC_TASK_ASYNC,
1907         };
1908         int status;
1909
1910         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1911         kref_get(&data->kref);
1912         data->rpc_done = 0;
1913         data->rpc_status = 0;
1914         data->cancelled = 0;
1915         data->is_recover = 0;
1916         if (isrecover) {
1917                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1918                 data->is_recover = 1;
1919         }
1920         task = rpc_run_task(&task_setup_data);
1921         if (IS_ERR(task))
1922                 return PTR_ERR(task);
1923         status = nfs4_wait_for_completion_rpc_task(task);
1924         if (status != 0) {
1925                 data->cancelled = 1;
1926                 smp_wmb();
1927         } else
1928                 status = data->rpc_status;
1929         rpc_put_task(task);
1930
1931         return status;
1932 }
1933
1934 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1935 {
1936         struct inode *dir = data->dir->d_inode;
1937         struct nfs_openres *o_res = &data->o_res;
1938         int status;
1939
1940         status = nfs4_run_open_task(data, 1);
1941         if (status != 0 || !data->rpc_done)
1942                 return status;
1943
1944         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1945
1946         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1947                 status = _nfs4_proc_open_confirm(data);
1948                 if (status != 0)
1949                         return status;
1950         }
1951
1952         return status;
1953 }
1954
1955 /*
1956  * Additional permission checks in order to distinguish between an
1957  * open for read, and an open for execute. This works around the
1958  * fact that NFSv4 OPEN treats read and execute permissions as being
1959  * the same.
1960  * Note that in the non-execute case, we want to turn off permission
1961  * checking if we just created a new file (POSIX open() semantics).
1962  */
1963 static int nfs4_opendata_access(struct rpc_cred *cred,
1964                                 struct nfs4_opendata *opendata,
1965                                 struct nfs4_state *state, fmode_t fmode,
1966                                 int openflags)
1967 {
1968         struct nfs_access_entry cache;
1969         u32 mask;
1970
1971         /* access call failed or for some reason the server doesn't
1972          * support any access modes -- defer access call until later */
1973         if (opendata->o_res.access_supported == 0)
1974                 return 0;
1975
1976         mask = 0;
1977         /*
1978          * Use openflags to check for exec, because fmode won't
1979          * always have FMODE_EXEC set when file open for exec.
1980          */
1981         if (openflags & __FMODE_EXEC) {
1982                 /* ONLY check for exec rights */
1983                 mask = MAY_EXEC;
1984         } else if ((fmode & FMODE_READ) && !opendata->file_created)
1985                 mask = MAY_READ;
1986
1987         cache.cred = cred;
1988         cache.jiffies = jiffies;
1989         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1990         nfs_access_add_cache(state->inode, &cache);
1991
1992         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1993                 return 0;
1994
1995         /* even though OPEN succeeded, access is denied. Close the file */
1996         nfs4_close_state(state, fmode);
1997         return -EACCES;
1998 }
1999
2000 /*
2001  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2002  */
2003 static int _nfs4_proc_open(struct nfs4_opendata *data)
2004 {
2005         struct inode *dir = data->dir->d_inode;
2006         struct nfs_server *server = NFS_SERVER(dir);
2007         struct nfs_openargs *o_arg = &data->o_arg;
2008         struct nfs_openres *o_res = &data->o_res;
2009         int status;
2010
2011         status = nfs4_run_open_task(data, 0);
2012         if (!data->rpc_done)
2013                 return status;
2014         if (status != 0) {
2015                 if (status == -NFS4ERR_BADNAME &&
2016                                 !(o_arg->open_flags & O_CREAT))
2017                         return -ENOENT;
2018                 return status;
2019         }
2020
2021         nfs_fattr_map_and_free_names(server, &data->f_attr);
2022
2023         if (o_arg->open_flags & O_CREAT) {
2024                 update_changeattr(dir, &o_res->cinfo);
2025                 if (o_arg->open_flags & O_EXCL)
2026                         data->file_created = 1;
2027                 else if (o_res->cinfo.before != o_res->cinfo.after)
2028                         data->file_created = 1;
2029         }
2030         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2031                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2032         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2033                 status = _nfs4_proc_open_confirm(data);
2034                 if (status != 0)
2035                         return status;
2036         }
2037         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2038                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2039         return 0;
2040 }
2041
2042 static int nfs4_recover_expired_lease(struct nfs_server *server)
2043 {
2044         return nfs4_client_recover_expired_lease(server->nfs_client);
2045 }
2046
2047 /*
2048  * OPEN_EXPIRED:
2049  *      reclaim state on the server after a network partition.
2050  *      Assumes caller holds the appropriate lock
2051  */
2052 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2053 {
2054         struct nfs4_opendata *opendata;
2055         int ret;
2056
2057         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2058                         NFS4_OPEN_CLAIM_FH);
2059         if (IS_ERR(opendata))
2060                 return PTR_ERR(opendata);
2061         ret = nfs4_open_recover(opendata, state);
2062         if (ret == -ESTALE)
2063                 d_drop(ctx->dentry);
2064         nfs4_opendata_put(opendata);
2065         return ret;
2066 }
2067
2068 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2069 {
2070         struct nfs_server *server = NFS_SERVER(state->inode);
2071         struct nfs4_exception exception = { };
2072         int err;
2073
2074         do {
2075                 err = _nfs4_open_expired(ctx, state);
2076                 trace_nfs4_open_expired(ctx, 0, err);
2077                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2078                         continue;
2079                 switch (err) {
2080                 default:
2081                         goto out;
2082                 case -NFS4ERR_GRACE:
2083                 case -NFS4ERR_DELAY:
2084                         nfs4_handle_exception(server, err, &exception);
2085                         err = 0;
2086                 }
2087         } while (exception.retry);
2088 out:
2089         return err;
2090 }
2091
2092 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2093 {
2094         struct nfs_open_context *ctx;
2095         int ret;
2096
2097         ctx = nfs4_state_find_open_context(state);
2098         if (IS_ERR(ctx))
2099                 return -EAGAIN;
2100         ret = nfs4_do_open_expired(ctx, state);
2101         put_nfs_open_context(ctx);
2102         return ret;
2103 }
2104
2105 #if defined(CONFIG_NFS_V4_1)
2106 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2107 {
2108         struct nfs_server *server = NFS_SERVER(state->inode);
2109         nfs4_stateid *stateid = &state->stateid;
2110         struct nfs_delegation *delegation;
2111         struct rpc_cred *cred = NULL;
2112         int status = -NFS4ERR_BAD_STATEID;
2113
2114         /* If a state reset has been done, test_stateid is unneeded */
2115         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2116                 return;
2117
2118         /* Get the delegation credential for use by test/free_stateid */
2119         rcu_read_lock();
2120         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2121         if (delegation != NULL &&
2122             nfs4_stateid_match(&delegation->stateid, stateid)) {
2123                 cred = get_rpccred(delegation->cred);
2124                 rcu_read_unlock();
2125                 status = nfs41_test_stateid(server, stateid, cred);
2126                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2127         } else
2128                 rcu_read_unlock();
2129
2130         if (status != NFS_OK) {
2131                 /* Free the stateid unless the server explicitly
2132                  * informs us the stateid is unrecognized. */
2133                 if (status != -NFS4ERR_BAD_STATEID)
2134                         nfs41_free_stateid(server, stateid, cred);
2135                 nfs_remove_bad_delegation(state->inode);
2136
2137                 write_seqlock(&state->seqlock);
2138                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2139                 write_sequnlock(&state->seqlock);
2140                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2141         }
2142
2143         if (cred != NULL)
2144                 put_rpccred(cred);
2145 }
2146
2147 /**
2148  * nfs41_check_open_stateid - possibly free an open stateid
2149  *
2150  * @state: NFSv4 state for an inode
2151  *
2152  * Returns NFS_OK if recovery for this stateid is now finished.
2153  * Otherwise a negative NFS4ERR value is returned.
2154  */
2155 static int nfs41_check_open_stateid(struct nfs4_state *state)
2156 {
2157         struct nfs_server *server = NFS_SERVER(state->inode);
2158         nfs4_stateid *stateid = &state->open_stateid;
2159         struct rpc_cred *cred = state->owner->so_cred;
2160         int status;
2161
2162         /* If a state reset has been done, test_stateid is unneeded */
2163         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2164             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2165             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2166                 return -NFS4ERR_BAD_STATEID;
2167
2168         status = nfs41_test_stateid(server, stateid, cred);
2169         trace_nfs4_test_open_stateid(state, NULL, status);
2170         if (status != NFS_OK) {
2171                 /* Free the stateid unless the server explicitly
2172                  * informs us the stateid is unrecognized. */
2173                 if (status != -NFS4ERR_BAD_STATEID)
2174                         nfs41_free_stateid(server, stateid, cred);
2175
2176                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2177                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2178                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2179                 clear_bit(NFS_OPEN_STATE, &state->flags);
2180         }
2181         return status;
2182 }
2183
2184 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2185 {
2186         int status;
2187
2188         nfs41_clear_delegation_stateid(state);
2189         status = nfs41_check_open_stateid(state);
2190         if (status != NFS_OK)
2191                 status = nfs4_open_expired(sp, state);
2192         return status;
2193 }
2194 #endif
2195
2196 /*
2197  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2198  * fields corresponding to attributes that were used to store the verifier.
2199  * Make sure we clobber those fields in the later setattr call
2200  */
2201 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2202 {
2203         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2204             !(sattr->ia_valid & ATTR_ATIME_SET))
2205                 sattr->ia_valid |= ATTR_ATIME;
2206
2207         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2208             !(sattr->ia_valid & ATTR_MTIME_SET))
2209                 sattr->ia_valid |= ATTR_MTIME;
2210 }
2211
2212 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2213                 fmode_t fmode,
2214                 int flags,
2215                 struct nfs_open_context *ctx)
2216 {
2217         struct nfs4_state_owner *sp = opendata->owner;
2218         struct nfs_server *server = sp->so_server;
2219         struct dentry *dentry;
2220         struct nfs4_state *state;
2221         unsigned int seq;
2222         int ret;
2223
2224         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2225
2226         ret = _nfs4_proc_open(opendata);
2227         if (ret != 0) {
2228                 if (ret == -ENOENT) {
2229                         d_drop(opendata->dentry);
2230                         d_add(opendata->dentry, NULL);
2231                         nfs_set_verifier(opendata->dentry,
2232                                          nfs_save_change_attribute(opendata->dir->d_inode));
2233                 }
2234                 goto out;
2235         }
2236
2237         state = nfs4_opendata_to_nfs4_state(opendata);
2238         ret = PTR_ERR(state);
2239         if (IS_ERR(state))
2240                 goto out;
2241         if (server->caps & NFS_CAP_POSIX_LOCK)
2242                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2243
2244         dentry = opendata->dentry;
2245         if (dentry->d_inode == NULL) {
2246                 /* FIXME: Is this d_drop() ever needed? */
2247                 d_drop(dentry);
2248                 dentry = d_add_unique(dentry, igrab(state->inode));
2249                 if (dentry == NULL) {
2250                         dentry = opendata->dentry;
2251                 } else if (dentry != ctx->dentry) {
2252                         dput(ctx->dentry);
2253                         ctx->dentry = dget(dentry);
2254                 }
2255                 nfs_set_verifier(dentry,
2256                                 nfs_save_change_attribute(opendata->dir->d_inode));
2257         }
2258
2259         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2260         if (ret != 0)
2261                 goto out;
2262
2263         ctx->state = state;
2264         if (dentry->d_inode == state->inode) {
2265                 nfs_inode_attach_open_context(ctx);
2266                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2267                         nfs4_schedule_stateid_recovery(server, state);
2268         }
2269 out:
2270         return ret;
2271 }
2272
2273 /*
2274  * Returns a referenced nfs4_state
2275  */
2276 static int _nfs4_do_open(struct inode *dir,
2277                         struct nfs_open_context *ctx,
2278                         int flags,
2279                         struct iattr *sattr,
2280                         struct nfs4_label *label,
2281                         int *opened)
2282 {
2283         struct nfs4_state_owner  *sp;
2284         struct nfs4_state     *state = NULL;
2285         struct nfs_server       *server = NFS_SERVER(dir);
2286         struct nfs4_opendata *opendata;
2287         struct dentry *dentry = ctx->dentry;
2288         struct rpc_cred *cred = ctx->cred;
2289         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2290         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2291         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2292         struct nfs4_label *olabel = NULL;
2293         int status;
2294
2295         /* Protect against reboot recovery conflicts */
2296         status = -ENOMEM;
2297         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2298         if (sp == NULL) {
2299                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2300                 goto out_err;
2301         }
2302         status = nfs4_recover_expired_lease(server);
2303         if (status != 0)
2304                 goto err_put_state_owner;
2305         if (dentry->d_inode != NULL)
2306                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2307         status = -ENOMEM;
2308         if (dentry->d_inode)
2309                 claim = NFS4_OPEN_CLAIM_FH;
2310         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2311                         label, claim, GFP_KERNEL);
2312         if (opendata == NULL)
2313                 goto err_put_state_owner;
2314
2315         if (label) {
2316                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2317                 if (IS_ERR(olabel)) {
2318                         status = PTR_ERR(olabel);
2319                         goto err_opendata_put;
2320                 }
2321         }
2322
2323         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2324                 if (!opendata->f_attr.mdsthreshold) {
2325                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2326                         if (!opendata->f_attr.mdsthreshold)
2327                                 goto err_free_label;
2328                 }
2329                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2330         }
2331         if (dentry->d_inode != NULL)
2332                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2333
2334         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2335         if (status != 0)
2336                 goto err_free_label;
2337         state = ctx->state;
2338
2339         if ((opendata->o_arg.open_flags & O_EXCL) &&
2340             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2341                 nfs4_exclusive_attrset(opendata, sattr);
2342
2343                 nfs_fattr_init(opendata->o_res.f_attr);
2344                 status = nfs4_do_setattr(state->inode, cred,
2345                                 opendata->o_res.f_attr, sattr,
2346                                 state, label, olabel);
2347                 if (status == 0) {
2348                         nfs_setattr_update_inode(state->inode, sattr);
2349                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2350                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2351                 }
2352         }
2353         if (opendata->file_created)
2354                 *opened |= FILE_CREATED;
2355
2356         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2357                 *ctx_th = opendata->f_attr.mdsthreshold;
2358                 opendata->f_attr.mdsthreshold = NULL;
2359         }
2360
2361         nfs4_label_free(olabel);
2362
2363         nfs4_opendata_put(opendata);
2364         nfs4_put_state_owner(sp);
2365         return 0;
2366 err_free_label:
2367         nfs4_label_free(olabel);
2368 err_opendata_put:
2369         nfs4_opendata_put(opendata);
2370 err_put_state_owner:
2371         nfs4_put_state_owner(sp);
2372 out_err:
2373         return status;
2374 }
2375
2376
2377 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2378                                         struct nfs_open_context *ctx,
2379                                         int flags,
2380                                         struct iattr *sattr,
2381                                         struct nfs4_label *label,
2382                                         int *opened)
2383 {
2384         struct nfs_server *server = NFS_SERVER(dir);
2385         struct nfs4_exception exception = { };
2386         struct nfs4_state *res;
2387         int status;
2388
2389         do {
2390                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2391                 res = ctx->state;
2392                 trace_nfs4_open_file(ctx, flags, status);
2393                 if (status == 0)
2394                         break;
2395                 /* NOTE: BAD_SEQID means the server and client disagree about the
2396                  * book-keeping w.r.t. state-changing operations
2397                  * (OPEN/CLOSE/LOCK/LOCKU...)
2398                  * It is actually a sign of a bug on the client or on the server.
2399                  *
2400                  * If we receive a BAD_SEQID error in the particular case of
2401                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2402                  * have unhashed the old state_owner for us, and that we can
2403                  * therefore safely retry using a new one. We should still warn
2404                  * the user though...
2405                  */
2406                 if (status == -NFS4ERR_BAD_SEQID) {
2407                         pr_warn_ratelimited("NFS: v4 server %s "
2408                                         " returned a bad sequence-id error!\n",
2409                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2410                         exception.retry = 1;
2411                         continue;
2412                 }
2413                 /*
2414                  * BAD_STATEID on OPEN means that the server cancelled our
2415                  * state before it received the OPEN_CONFIRM.
2416                  * Recover by retrying the request as per the discussion
2417                  * on Page 181 of RFC3530.
2418                  */
2419                 if (status == -NFS4ERR_BAD_STATEID) {
2420                         exception.retry = 1;
2421                         continue;
2422                 }
2423                 if (status == -EAGAIN) {
2424                         /* We must have found a delegation */
2425                         exception.retry = 1;
2426                         continue;
2427                 }
2428                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2429                         continue;
2430                 res = ERR_PTR(nfs4_handle_exception(server,
2431                                         status, &exception));
2432         } while (exception.retry);
2433         return res;
2434 }
2435
2436 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2437                             struct nfs_fattr *fattr, struct iattr *sattr,
2438                             struct nfs4_state *state, struct nfs4_label *ilabel,
2439                             struct nfs4_label *olabel)
2440 {
2441         struct nfs_server *server = NFS_SERVER(inode);
2442         struct nfs_setattrargs  arg = {
2443                 .fh             = NFS_FH(inode),
2444                 .iap            = sattr,
2445                 .server         = server,
2446                 .bitmask = server->attr_bitmask,
2447                 .label          = ilabel,
2448         };
2449         struct nfs_setattrres  res = {
2450                 .fattr          = fattr,
2451                 .label          = olabel,
2452                 .server         = server,
2453         };
2454         struct rpc_message msg = {
2455                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2456                 .rpc_argp       = &arg,
2457                 .rpc_resp       = &res,
2458                 .rpc_cred       = cred,
2459         };
2460         unsigned long timestamp = jiffies;
2461         fmode_t fmode;
2462         bool truncate;
2463         int status;
2464
2465         arg.bitmask = nfs4_bitmask(server, ilabel);
2466         if (ilabel)
2467                 arg.bitmask = nfs4_bitmask(server, olabel);
2468
2469         nfs_fattr_init(fattr);
2470
2471         /* Servers should only apply open mode checks for file size changes */
2472         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2473         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2474
2475         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2476                 /* Use that stateid */
2477         } else if (truncate && state != NULL) {
2478                 struct nfs_lockowner lockowner = {
2479                         .l_owner = current->files,
2480                         .l_pid = current->tgid,
2481                 };
2482                 if (!nfs4_valid_open_stateid(state))
2483                         return -EBADF;
2484                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2485                                 &lockowner) == -EIO)
2486                         return -EBADF;
2487         } else
2488                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2489
2490         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2491         if (status == 0 && state != NULL)
2492                 renew_lease(server, timestamp);
2493         return status;
2494 }
2495
2496 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2497                            struct nfs_fattr *fattr, struct iattr *sattr,
2498                            struct nfs4_state *state, struct nfs4_label *ilabel,
2499                            struct nfs4_label *olabel)
2500 {
2501         struct nfs_server *server = NFS_SERVER(inode);
2502         struct nfs4_exception exception = {
2503                 .state = state,
2504                 .inode = inode,
2505         };
2506         int err;
2507         do {
2508                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2509                 trace_nfs4_setattr(inode, err);
2510                 switch (err) {
2511                 case -NFS4ERR_OPENMODE:
2512                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2513                                 pr_warn_once("NFSv4: server %s is incorrectly "
2514                                                 "applying open mode checks to "
2515                                                 "a SETATTR that is not "
2516                                                 "changing file size.\n",
2517                                                 server->nfs_client->cl_hostname);
2518                         }
2519                         if (state && !(state->state & FMODE_WRITE)) {
2520                                 err = -EBADF;
2521                                 if (sattr->ia_valid & ATTR_OPEN)
2522                                         err = -EACCES;
2523                                 goto out;
2524                         }
2525                 }
2526                 err = nfs4_handle_exception(server, err, &exception);
2527         } while (exception.retry);
2528 out:
2529         return err;
2530 }
2531
2532 struct nfs4_closedata {
2533         struct inode *inode;
2534         struct nfs4_state *state;
2535         struct nfs_closeargs arg;
2536         struct nfs_closeres res;
2537         struct nfs_fattr fattr;
2538         unsigned long timestamp;
2539         bool roc;
2540         u32 roc_barrier;
2541 };
2542
2543 static void nfs4_free_closedata(void *data)
2544 {
2545         struct nfs4_closedata *calldata = data;
2546         struct nfs4_state_owner *sp = calldata->state->owner;
2547         struct super_block *sb = calldata->state->inode->i_sb;
2548
2549         if (calldata->roc)
2550                 pnfs_roc_release(calldata->state->inode);
2551         nfs4_put_open_state(calldata->state);
2552         nfs_free_seqid(calldata->arg.seqid);
2553         nfs4_put_state_owner(sp);
2554         nfs_sb_deactive(sb);
2555         kfree(calldata);
2556 }
2557
2558 static void nfs4_close_done(struct rpc_task *task, void *data)
2559 {
2560         struct nfs4_closedata *calldata = data;
2561         struct nfs4_state *state = calldata->state;
2562         struct nfs_server *server = NFS_SERVER(calldata->inode);
2563
2564         dprintk("%s: begin!\n", __func__);
2565         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2566                 return;
2567         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2568         /* hmm. we are done with the inode, and in the process of freeing
2569          * the state_owner. we keep this around to process errors
2570          */
2571         switch (task->tk_status) {
2572                 case 0:
2573                         if (calldata->roc)
2574                                 pnfs_roc_set_barrier(state->inode,
2575                                                      calldata->roc_barrier);
2576                         nfs_clear_open_stateid(state, &calldata->res.stateid, 0);
2577                         renew_lease(server, calldata->timestamp);
2578                         goto out_release;
2579                 case -NFS4ERR_ADMIN_REVOKED:
2580                 case -NFS4ERR_STALE_STATEID:
2581                 case -NFS4ERR_OLD_STATEID:
2582                 case -NFS4ERR_BAD_STATEID:
2583                 case -NFS4ERR_EXPIRED:
2584                         if (calldata->arg.fmode == 0)
2585                                 break;
2586                 default:
2587                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
2588                                 rpc_restart_call_prepare(task);
2589                                 goto out_release;
2590                         }
2591         }
2592         nfs_clear_open_stateid(state, NULL, calldata->arg.fmode);
2593 out_release:
2594         nfs_release_seqid(calldata->arg.seqid);
2595         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2596         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2597 }
2598
2599 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2600 {
2601         struct nfs4_closedata *calldata = data;
2602         struct nfs4_state *state = calldata->state;
2603         struct inode *inode = calldata->inode;
2604         int call_close = 0;
2605
2606         dprintk("%s: begin!\n", __func__);
2607         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2608                 goto out_wait;
2609
2610         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2611         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2612         spin_lock(&state->owner->so_lock);
2613         /* Calculate the change in open mode */
2614         if (state->n_rdwr == 0) {
2615                 if (state->n_rdonly == 0) {
2616                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2617                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2618                         calldata->arg.fmode &= ~FMODE_READ;
2619                 }
2620                 if (state->n_wronly == 0) {
2621                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2622                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2623                         calldata->arg.fmode &= ~FMODE_WRITE;
2624                 }
2625         }
2626         if (!nfs4_valid_open_stateid(state))
2627                 call_close = 0;
2628         spin_unlock(&state->owner->so_lock);
2629
2630         if (!call_close) {
2631                 /* Note: exit _without_ calling nfs4_close_done */
2632                 goto out_no_action;
2633         }
2634
2635         if (calldata->arg.fmode == 0) {
2636                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2637                 if (calldata->roc &&
2638                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2639                         nfs_release_seqid(calldata->arg.seqid);
2640                         goto out_wait;
2641                     }
2642         }
2643
2644         nfs_fattr_init(calldata->res.fattr);
2645         calldata->timestamp = jiffies;
2646         if (nfs4_setup_sequence(NFS_SERVER(inode),
2647                                 &calldata->arg.seq_args,
2648                                 &calldata->res.seq_res,
2649                                 task) != 0)
2650                 nfs_release_seqid(calldata->arg.seqid);
2651         dprintk("%s: done!\n", __func__);
2652         return;
2653 out_no_action:
2654         task->tk_action = NULL;
2655 out_wait:
2656         nfs4_sequence_done(task, &calldata->res.seq_res);
2657 }
2658
2659 static const struct rpc_call_ops nfs4_close_ops = {
2660         .rpc_call_prepare = nfs4_close_prepare,
2661         .rpc_call_done = nfs4_close_done,
2662         .rpc_release = nfs4_free_closedata,
2663 };
2664
2665 static bool nfs4_state_has_opener(struct nfs4_state *state)
2666 {
2667         /* first check existing openers */
2668         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2669             state->n_rdonly != 0)
2670                 return true;
2671
2672         if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2673             state->n_wronly != 0)
2674                 return true;
2675
2676         if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2677             state->n_rdwr != 0)
2678                 return true;
2679
2680         return false;
2681 }
2682
2683 static bool nfs4_roc(struct inode *inode)
2684 {
2685         struct nfs_inode *nfsi = NFS_I(inode);
2686         struct nfs_open_context *ctx;
2687         struct nfs4_state *state;
2688
2689         spin_lock(&inode->i_lock);
2690         list_for_each_entry(ctx, &nfsi->open_files, list) {
2691                 state = ctx->state;
2692                 if (state == NULL)
2693                         continue;
2694                 if (nfs4_state_has_opener(state)) {
2695                         spin_unlock(&inode->i_lock);
2696                         return false;
2697                 }
2698         }
2699         spin_unlock(&inode->i_lock);
2700
2701         if (nfs4_check_delegation(inode, FMODE_READ))
2702                 return false;
2703
2704         return pnfs_roc(inode);
2705 }
2706
2707 /*
2708  * It is possible for data to be read/written from a mem-mapped file
2709  * after the sys_close call (which hits the vfs layer as a flush).
2710  * This means that we can't safely call nfsv4 close on a file until
2711  * the inode is cleared. This in turn means that we are not good
2712  * NFSv4 citizens - we do not indicate to the server to update the file's
2713  * share state even when we are done with one of the three share
2714  * stateid's in the inode.
2715  *
2716  * NOTE: Caller must be holding the sp->so_owner semaphore!
2717  */
2718 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2719 {
2720         struct nfs_server *server = NFS_SERVER(state->inode);
2721         struct nfs4_closedata *calldata;
2722         struct nfs4_state_owner *sp = state->owner;
2723         struct rpc_task *task;
2724         struct rpc_message msg = {
2725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2726                 .rpc_cred = state->owner->so_cred,
2727         };
2728         struct rpc_task_setup task_setup_data = {
2729                 .rpc_client = server->client,
2730                 .rpc_message = &msg,
2731                 .callback_ops = &nfs4_close_ops,
2732                 .workqueue = nfsiod_workqueue,
2733                 .flags = RPC_TASK_ASYNC,
2734         };
2735         int status = -ENOMEM;
2736
2737         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2738                 &task_setup_data.rpc_client, &msg);
2739
2740         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2741         if (calldata == NULL)
2742                 goto out;
2743         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2744         calldata->inode = state->inode;
2745         calldata->state = state;
2746         calldata->arg.fh = NFS_FH(state->inode);
2747         calldata->arg.stateid = &state->open_stateid;
2748         /* Serialization for the sequence id */
2749         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2750         if (calldata->arg.seqid == NULL)
2751                 goto out_free_calldata;
2752         calldata->arg.fmode = 0;
2753         calldata->arg.bitmask = server->cache_consistency_bitmask;
2754         calldata->res.fattr = &calldata->fattr;
2755         calldata->res.seqid = calldata->arg.seqid;
2756         calldata->res.server = server;
2757         calldata->roc = nfs4_roc(state->inode);
2758         nfs_sb_active(calldata->inode->i_sb);
2759
2760         msg.rpc_argp = &calldata->arg;
2761         msg.rpc_resp = &calldata->res;
2762         task_setup_data.callback_data = calldata;
2763         task = rpc_run_task(&task_setup_data);
2764         if (IS_ERR(task))
2765                 return PTR_ERR(task);
2766         status = 0;
2767         if (wait)
2768                 status = rpc_wait_for_completion_task(task);
2769         rpc_put_task(task);
2770         return status;
2771 out_free_calldata:
2772         kfree(calldata);
2773 out:
2774         nfs4_put_open_state(state);
2775         nfs4_put_state_owner(sp);
2776         return status;
2777 }
2778
2779 static struct inode *
2780 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2781                 int open_flags, struct iattr *attr, int *opened)
2782 {
2783         struct nfs4_state *state;
2784         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2785
2786         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2787
2788         /* Protect against concurrent sillydeletes */
2789         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2790
2791         nfs4_label_release_security(label);
2792
2793         if (IS_ERR(state))
2794                 return ERR_CAST(state);
2795         return state->inode;
2796 }
2797
2798 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2799 {
2800         if (ctx->state == NULL)
2801                 return;
2802         if (is_sync)
2803                 nfs4_close_sync(ctx->state, ctx->mode);
2804         else
2805                 nfs4_close_state(ctx->state, ctx->mode);
2806 }
2807
2808 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2809 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2810 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2811
2812 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2813 {
2814         struct nfs4_server_caps_arg args = {
2815                 .fhandle = fhandle,
2816         };
2817         struct nfs4_server_caps_res res = {};
2818         struct rpc_message msg = {
2819                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2820                 .rpc_argp = &args,
2821                 .rpc_resp = &res,
2822         };
2823         int status;
2824
2825         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2826         if (status == 0) {
2827                 /* Sanity check the server answers */
2828                 switch (server->nfs_client->cl_minorversion) {
2829                 case 0:
2830                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2831                         res.attr_bitmask[2] = 0;
2832                         break;
2833                 case 1:
2834                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2835                         break;
2836                 case 2:
2837                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2838                 }
2839                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2840                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2841                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2842                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2843                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2844                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2845                                 NFS_CAP_SECURITY_LABEL);
2846                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2847                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2848                         server->caps |= NFS_CAP_ACLS;
2849                 if (res.has_links != 0)
2850                         server->caps |= NFS_CAP_HARDLINKS;
2851                 if (res.has_symlinks != 0)
2852                         server->caps |= NFS_CAP_SYMLINKS;
2853                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2854                         server->caps |= NFS_CAP_FILEID;
2855                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2856                         server->caps |= NFS_CAP_MODE;
2857                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2858                         server->caps |= NFS_CAP_NLINK;
2859                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2860                         server->caps |= NFS_CAP_OWNER;
2861                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2862                         server->caps |= NFS_CAP_OWNER_GROUP;
2863                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2864                         server->caps |= NFS_CAP_ATIME;
2865                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2866                         server->caps |= NFS_CAP_CTIME;
2867                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2868                         server->caps |= NFS_CAP_MTIME;
2869 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2870                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2871                         server->caps |= NFS_CAP_SECURITY_LABEL;
2872 #endif
2873                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2874                                 sizeof(server->attr_bitmask));
2875                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2876
2877                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2878                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2879                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2880                 server->cache_consistency_bitmask[2] = 0;
2881                 server->acl_bitmask = res.acl_bitmask;
2882                 server->fh_expire_type = res.fh_expire_type;
2883         }
2884
2885         return status;
2886 }
2887
2888 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2889 {
2890         struct nfs4_exception exception = { };
2891         int err;
2892         do {
2893                 err = nfs4_handle_exception(server,
2894                                 _nfs4_server_capabilities(server, fhandle),
2895                                 &exception);
2896         } while (exception.retry);
2897         return err;
2898 }
2899
2900 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2901                 struct nfs_fsinfo *info)
2902 {
2903         u32 bitmask[3];
2904         struct nfs4_lookup_root_arg args = {
2905                 .bitmask = bitmask,
2906         };
2907         struct nfs4_lookup_res res = {
2908                 .server = server,
2909                 .fattr = info->fattr,
2910                 .fh = fhandle,
2911         };
2912         struct rpc_message msg = {
2913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2914                 .rpc_argp = &args,
2915                 .rpc_resp = &res,
2916         };
2917
2918         bitmask[0] = nfs4_fattr_bitmap[0];
2919         bitmask[1] = nfs4_fattr_bitmap[1];
2920         /*
2921          * Process the label in the upcoming getfattr
2922          */
2923         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2924
2925         nfs_fattr_init(info->fattr);
2926         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2927 }
2928
2929 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2930                 struct nfs_fsinfo *info)
2931 {
2932         struct nfs4_exception exception = { };
2933         int err;
2934         do {
2935                 err = _nfs4_lookup_root(server, fhandle, info);
2936                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2937                 switch (err) {
2938                 case 0:
2939                 case -NFS4ERR_WRONGSEC:
2940                         goto out;
2941                 default:
2942                         err = nfs4_handle_exception(server, err, &exception);
2943                 }
2944         } while (exception.retry);
2945 out:
2946         return err;
2947 }
2948
2949 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2950                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2951 {
2952         struct rpc_auth_create_args auth_args = {
2953                 .pseudoflavor = flavor,
2954         };
2955         struct rpc_auth *auth;
2956         int ret;
2957
2958         auth = rpcauth_create(&auth_args, server->client);
2959         if (IS_ERR(auth)) {
2960                 ret = -EACCES;
2961                 goto out;
2962         }
2963         ret = nfs4_lookup_root(server, fhandle, info);
2964 out:
2965         return ret;
2966 }
2967
2968 /*
2969  * Retry pseudoroot lookup with various security flavors.  We do this when:
2970  *
2971  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2972  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2973  *
2974  * Returns zero on success, or a negative NFS4ERR value, or a
2975  * negative errno value.
2976  */
2977 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2978                               struct nfs_fsinfo *info)
2979 {
2980         /* Per 3530bis 15.33.5 */
2981         static const rpc_authflavor_t flav_array[] = {
2982                 RPC_AUTH_GSS_KRB5P,
2983                 RPC_AUTH_GSS_KRB5I,
2984                 RPC_AUTH_GSS_KRB5,
2985                 RPC_AUTH_UNIX,                  /* courtesy */
2986                 RPC_AUTH_NULL,
2987         };
2988         int status = -EPERM;
2989         size_t i;
2990
2991         if (server->auth_info.flavor_len > 0) {
2992                 /* try each flavor specified by user */
2993                 for (i = 0; i < server->auth_info.flavor_len; i++) {
2994                         status = nfs4_lookup_root_sec(server, fhandle, info,
2995                                                 server->auth_info.flavors[i]);
2996                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2997                                 continue;
2998                         break;
2999                 }
3000         } else {
3001                 /* no flavors specified by user, try default list */
3002                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3003                         status = nfs4_lookup_root_sec(server, fhandle, info,
3004                                                       flav_array[i]);
3005                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3006                                 continue;
3007                         break;
3008                 }
3009         }
3010
3011         /*
3012          * -EACCESS could mean that the user doesn't have correct permissions
3013          * to access the mount.  It could also mean that we tried to mount
3014          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3015          * existing mount programs don't handle -EACCES very well so it should
3016          * be mapped to -EPERM instead.
3017          */
3018         if (status == -EACCES)
3019                 status = -EPERM;
3020         return status;
3021 }
3022
3023 static int nfs4_do_find_root_sec(struct nfs_server *server,
3024                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3025 {
3026         int mv = server->nfs_client->cl_minorversion;
3027         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3028 }
3029
3030 /**
3031  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3032  * @server: initialized nfs_server handle
3033  * @fhandle: we fill in the pseudo-fs root file handle
3034  * @info: we fill in an FSINFO struct
3035  * @auth_probe: probe the auth flavours
3036  *
3037  * Returns zero on success, or a negative errno.
3038  */
3039 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3040                          struct nfs_fsinfo *info,
3041                          bool auth_probe)
3042 {
3043         int status;
3044
3045         switch (auth_probe) {
3046         case false:
3047                 status = nfs4_lookup_root(server, fhandle, info);
3048                 if (status != -NFS4ERR_WRONGSEC)
3049                         break;
3050         default:
3051                 status = nfs4_do_find_root_sec(server, fhandle, info);
3052         }
3053
3054         if (status == 0)
3055                 status = nfs4_server_capabilities(server, fhandle);
3056         if (status == 0)
3057                 status = nfs4_do_fsinfo(server, fhandle, info);
3058
3059         return nfs4_map_errors(status);
3060 }
3061
3062 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3063                               struct nfs_fsinfo *info)
3064 {
3065         int error;
3066         struct nfs_fattr *fattr = info->fattr;
3067         struct nfs4_label *label = NULL;
3068
3069         error = nfs4_server_capabilities(server, mntfh);
3070         if (error < 0) {
3071                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3072                 return error;
3073         }
3074
3075         label = nfs4_label_alloc(server, GFP_KERNEL);
3076         if (IS_ERR(label))
3077                 return PTR_ERR(label);
3078
3079         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3080         if (error < 0) {
3081                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3082                 goto err_free_label;
3083         }
3084
3085         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3086             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3087                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3088
3089 err_free_label:
3090         nfs4_label_free(label);
3091
3092         return error;
3093 }
3094
3095 /*
3096  * Get locations and (maybe) other attributes of a referral.
3097  * Note that we'll actually follow the referral later when
3098  * we detect fsid mismatch in inode revalidation
3099  */
3100 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3101                              const struct qstr *name, struct nfs_fattr *fattr,
3102                              struct nfs_fh *fhandle)
3103 {
3104         int status = -ENOMEM;
3105         struct page *page = NULL;
3106         struct nfs4_fs_locations *locations = NULL;
3107
3108         page = alloc_page(GFP_KERNEL);
3109         if (page == NULL)
3110                 goto out;
3111         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3112         if (locations == NULL)
3113                 goto out;
3114
3115         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3116         if (status != 0)
3117                 goto out;
3118
3119         /*
3120          * If the fsid didn't change, this is a migration event, not a
3121          * referral.  Cause us to drop into the exception handler, which
3122          * will kick off migration recovery.
3123          */
3124         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3125                 dprintk("%s: server did not return a different fsid for"
3126                         " a referral at %s\n", __func__, name->name);
3127                 status = -NFS4ERR_MOVED;
3128                 goto out;
3129         }
3130         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3131         nfs_fixup_referral_attributes(&locations->fattr);
3132
3133         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3134         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3135         memset(fhandle, 0, sizeof(struct nfs_fh));
3136 out:
3137         if (page)
3138                 __free_page(page);
3139         kfree(locations);
3140         return status;
3141 }
3142
3143 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3144                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3145 {
3146         struct nfs4_getattr_arg args = {
3147                 .fh = fhandle,
3148                 .bitmask = server->attr_bitmask,
3149         };
3150         struct nfs4_getattr_res res = {
3151                 .fattr = fattr,
3152                 .label = label,
3153                 .server = server,
3154         };
3155         struct rpc_message msg = {
3156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3157                 .rpc_argp = &args,
3158                 .rpc_resp = &res,
3159         };
3160
3161         args.bitmask = nfs4_bitmask(server, label);
3162
3163         nfs_fattr_init(fattr);
3164         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3165 }
3166
3167 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3168                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3169 {
3170         struct nfs4_exception exception = { };
3171         int err;
3172         do {
3173                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3174                 trace_nfs4_getattr(server, fhandle, fattr, err);
3175                 err = nfs4_handle_exception(server, err,
3176                                 &exception);
3177         } while (exception.retry);
3178         return err;
3179 }
3180
3181 /*
3182  * The file is not closed if it is opened due to the a request to change
3183  * the size of the file. The open call will not be needed once the
3184  * VFS layer lookup-intents are implemented.
3185  *
3186  * Close is called when the inode is destroyed.
3187  * If we haven't opened the file for O_WRONLY, we
3188  * need to in the size_change case to obtain a stateid.
3189  *
3190  * Got race?
3191  * Because OPEN is always done by name in nfsv4, it is
3192  * possible that we opened a different file by the same
3193  * name.  We can recognize this race condition, but we
3194  * can't do anything about it besides returning an error.
3195  *
3196  * This will be fixed with VFS changes (lookup-intent).
3197  */
3198 static int
3199 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3200                   struct iattr *sattr)
3201 {
3202         struct inode *inode = dentry->d_inode;
3203         struct rpc_cred *cred = NULL;
3204         struct nfs4_state *state = NULL;
3205         struct nfs4_label *label = NULL;
3206         int status;
3207
3208         if (pnfs_ld_layoutret_on_setattr(inode))
3209                 pnfs_commit_and_return_layout(inode);
3210
3211         nfs_fattr_init(fattr);
3212
3213         /* Deal with open(O_TRUNC) */
3214         if (sattr->ia_valid & ATTR_OPEN)
3215                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3216
3217         /* Optimization: if the end result is no change, don't RPC */
3218         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3219                 return 0;
3220
3221         /* Search for an existing open(O_WRITE) file */
3222         if (sattr->ia_valid & ATTR_FILE) {
3223                 struct nfs_open_context *ctx;
3224
3225                 ctx = nfs_file_open_context(sattr->ia_file);
3226                 if (ctx) {
3227                         cred = ctx->cred;
3228                         state = ctx->state;
3229                 }
3230         }
3231
3232         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3233         if (IS_ERR(label))
3234                 return PTR_ERR(label);
3235
3236         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3237         if (status == 0) {
3238                 nfs_setattr_update_inode(inode, sattr);
3239                 nfs_setsecurity(inode, fattr, label);
3240         }
3241         nfs4_label_free(label);
3242         return status;
3243 }
3244
3245 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3246                 const struct qstr *name, struct nfs_fh *fhandle,
3247                 struct nfs_fattr *fattr, struct nfs4_label *label)
3248 {
3249         struct nfs_server *server = NFS_SERVER(dir);
3250         int                    status;
3251         struct nfs4_lookup_arg args = {
3252                 .bitmask = server->attr_bitmask,
3253                 .dir_fh = NFS_FH(dir),
3254                 .name = name,
3255         };
3256         struct nfs4_lookup_res res = {
3257                 .server = server,
3258                 .fattr = fattr,
3259                 .label = label,
3260                 .fh = fhandle,
3261         };
3262         struct rpc_message msg = {
3263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3264                 .rpc_argp = &args,
3265                 .rpc_resp = &res,
3266         };
3267
3268         args.bitmask = nfs4_bitmask(server, label);
3269
3270         nfs_fattr_init(fattr);
3271
3272         dprintk("NFS call  lookup %s\n", name->name);
3273         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3274         dprintk("NFS reply lookup: %d\n", status);
3275         return status;
3276 }
3277
3278 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3279 {
3280         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3281                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3282         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3283         fattr->nlink = 2;
3284 }
3285
3286 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3287                                    struct qstr *name, struct nfs_fh *fhandle,
3288                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3289 {
3290         struct nfs4_exception exception = { };
3291         struct rpc_clnt *client = *clnt;
3292         int err;
3293         do {
3294                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3295                 trace_nfs4_lookup(dir, name, err);
3296                 switch (err) {
3297                 case -NFS4ERR_BADNAME:
3298                         err = -ENOENT;
3299                         goto out;
3300                 case -NFS4ERR_MOVED:
3301                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3302                         goto out;
3303                 case -NFS4ERR_WRONGSEC:
3304                         err = -EPERM;
3305                         if (client != *clnt)
3306                                 goto out;
3307                         client = nfs4_negotiate_security(client, dir, name);
3308                         if (IS_ERR(client))
3309                                 return PTR_ERR(client);
3310
3311                         exception.retry = 1;
3312                         break;
3313                 default:
3314                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3315                 }
3316         } while (exception.retry);
3317
3318 out:
3319         if (err == 0)
3320                 *clnt = client;
3321         else if (client != *clnt)
3322                 rpc_shutdown_client(client);
3323
3324         return err;
3325 }
3326
3327 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3328                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3329                             struct nfs4_label *label)
3330 {
3331         int status;
3332         struct rpc_clnt *client = NFS_CLIENT(dir);
3333
3334         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3335         if (client != NFS_CLIENT(dir)) {
3336                 rpc_shutdown_client(client);
3337                 nfs_fixup_secinfo_attributes(fattr);
3338         }
3339         return status;
3340 }
3341
3342 struct rpc_clnt *
3343 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3344                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3345 {
3346         struct rpc_clnt *client = NFS_CLIENT(dir);
3347         int status;
3348
3349         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3350         if (status < 0)
3351                 return ERR_PTR(status);
3352         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3353 }
3354
3355 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3356 {
3357         struct nfs_server *server = NFS_SERVER(inode);
3358         struct nfs4_accessargs args = {
3359                 .fh = NFS_FH(inode),
3360                 .bitmask = server->cache_consistency_bitmask,
3361         };
3362         struct nfs4_accessres res = {
3363                 .server = server,
3364         };
3365         struct rpc_message msg = {
3366                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3367                 .rpc_argp = &args,
3368                 .rpc_resp = &res,
3369                 .rpc_cred = entry->cred,
3370         };
3371         int mode = entry->mask;
3372         int status = 0;
3373
3374         /*
3375          * Determine which access bits we want to ask for...
3376          */
3377         if (mode & MAY_READ)
3378                 args.access |= NFS4_ACCESS_READ;
3379         if (S_ISDIR(inode->i_mode)) {
3380                 if (mode & MAY_WRITE)
3381                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3382                 if (mode & MAY_EXEC)
3383                         args.access |= NFS4_ACCESS_LOOKUP;
3384         } else {
3385                 if (mode & MAY_WRITE)
3386                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3387                 if (mode & MAY_EXEC)
3388                         args.access |= NFS4_ACCESS_EXECUTE;
3389         }
3390
3391         res.fattr = nfs_alloc_fattr();
3392         if (res.fattr == NULL)
3393                 return -ENOMEM;
3394
3395         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3396         if (!status) {
3397                 nfs_access_set_mask(entry, res.access);
3398                 nfs_refresh_inode(inode, res.fattr);
3399         }
3400         nfs_free_fattr(res.fattr);
3401         return status;
3402 }
3403
3404 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3405 {
3406         struct nfs4_exception exception = { };
3407         int err;
3408         do {
3409                 err = _nfs4_proc_access(inode, entry);
3410                 trace_nfs4_access(inode, err);
3411                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3412                                 &exception);
3413         } while (exception.retry);
3414         return err;
3415 }
3416
3417 /*
3418  * TODO: For the time being, we don't try to get any attributes
3419  * along with any of the zero-copy operations READ, READDIR,
3420  * READLINK, WRITE.
3421  *
3422  * In the case of the first three, we want to put the GETATTR
3423  * after the read-type operation -- this is because it is hard
3424  * to predict the length of a GETATTR response in v4, and thus
3425  * align the READ data correctly.  This means that the GETATTR
3426  * may end up partially falling into the page cache, and we should
3427  * shift it into the 'tail' of the xdr_buf before processing.
3428  * To do this efficiently, we need to know the total length
3429  * of data received, which doesn't seem to be available outside
3430  * of the RPC layer.
3431  *
3432  * In the case of WRITE, we also want to put the GETATTR after
3433  * the operation -- in this case because we want to make sure
3434  * we get the post-operation mtime and size.
3435  *
3436  * Both of these changes to the XDR layer would in fact be quite
3437  * minor, but I decided to leave them for a subsequent patch.
3438  */
3439 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3440                 unsigned int pgbase, unsigned int pglen)
3441 {
3442         struct nfs4_readlink args = {
3443                 .fh       = NFS_FH(inode),
3444                 .pgbase   = pgbase,
3445                 .pglen    = pglen,
3446                 .pages    = &page,
3447         };
3448         struct nfs4_readlink_res res;
3449         struct rpc_message msg = {
3450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3451                 .rpc_argp = &args,
3452                 .rpc_resp = &res,
3453         };
3454
3455         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3456 }
3457
3458 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3459                 unsigned int pgbase, unsigned int pglen)
3460 {
3461         struct nfs4_exception exception = { };
3462         int err;
3463         do {
3464                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3465                 trace_nfs4_readlink(inode, err);
3466                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3467                                 &exception);
3468         } while (exception.retry);
3469         return err;
3470 }
3471
3472 /*
3473  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3474  */
3475 static int
3476 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3477                  int flags)
3478 {
3479         struct nfs4_label l, *ilabel = NULL;
3480         struct nfs_open_context *ctx;
3481         struct nfs4_state *state;
3482         int opened = 0;
3483         int status = 0;
3484
3485         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3486         if (IS_ERR(ctx))
3487                 return PTR_ERR(ctx);
3488
3489         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3490
3491         sattr->ia_mode &= ~current_umask();
3492         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3493         if (IS_ERR(state)) {
3494                 status = PTR_ERR(state);
3495                 goto out;
3496         }
3497 out:
3498         nfs4_label_release_security(ilabel);
3499         put_nfs_open_context(ctx);
3500         return status;
3501 }
3502
3503 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3504 {
3505         struct nfs_server *server = NFS_SERVER(dir);
3506         struct nfs_removeargs args = {
3507                 .fh = NFS_FH(dir),
3508                 .name = *name,
3509         };
3510         struct nfs_removeres res = {
3511                 .server = server,
3512         };
3513         struct rpc_message msg = {
3514                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3515                 .rpc_argp = &args,
3516                 .rpc_resp = &res,
3517         };
3518         int status;
3519
3520         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3521         if (status == 0)
3522                 update_changeattr(dir, &res.cinfo);
3523         return status;
3524 }
3525
3526 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3527 {
3528         struct nfs4_exception exception = { };
3529         int err;
3530         do {
3531                 err = _nfs4_proc_remove(dir, name);
3532                 trace_nfs4_remove(dir, name, err);
3533                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3534                                 &exception);
3535         } while (exception.retry);
3536         return err;
3537 }
3538
3539 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3540 {
3541         struct nfs_server *server = NFS_SERVER(dir);
3542         struct nfs_removeargs *args = msg->rpc_argp;
3543         struct nfs_removeres *res = msg->rpc_resp;
3544
3545         res->server = server;
3546         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3547         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3548
3549         nfs_fattr_init(res->dir_attr);
3550 }
3551
3552 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3553 {
3554         nfs4_setup_sequence(NFS_SERVER(data->dir),
3555                         &data->args.seq_args,
3556                         &data->res.seq_res,
3557                         task);
3558 }
3559
3560 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3561 {
3562         struct nfs_unlinkdata *data = task->tk_calldata;
3563         struct nfs_removeres *res = &data->res;
3564
3565         if (!nfs4_sequence_done(task, &res->seq_res))
3566                 return 0;
3567         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3568                 return 0;
3569         update_changeattr(dir, &res->cinfo);
3570         return 1;
3571 }
3572
3573 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3574 {
3575         struct nfs_server *server = NFS_SERVER(dir);
3576         struct nfs_renameargs *arg = msg->rpc_argp;
3577         struct nfs_renameres *res = msg->rpc_resp;
3578
3579         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3580         res->server = server;
3581         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3582 }
3583
3584 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3585 {
3586         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3587                         &data->args.seq_args,
3588                         &data->res.seq_res,
3589                         task);
3590 }
3591
3592 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3593                                  struct inode *new_dir)
3594 {
3595         struct nfs_renamedata *data = task->tk_calldata;
3596         struct nfs_renameres *res = &data->res;
3597
3598         if (!nfs4_sequence_done(task, &res->seq_res))
3599                 return 0;
3600         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3601                 return 0;
3602
3603         update_changeattr(old_dir, &res->old_cinfo);
3604         update_changeattr(new_dir, &res->new_cinfo);
3605         return 1;
3606 }
3607
3608 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3609 {
3610         struct nfs_server *server = NFS_SERVER(inode);
3611         struct nfs4_link_arg arg = {
3612                 .fh     = NFS_FH(inode),
3613                 .dir_fh = NFS_FH(dir),
3614                 .name   = name,
3615                 .bitmask = server->attr_bitmask,
3616         };
3617         struct nfs4_link_res res = {
3618                 .server = server,
3619                 .label = NULL,
3620         };
3621         struct rpc_message msg = {
3622                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3623                 .rpc_argp = &arg,
3624                 .rpc_resp = &res,
3625         };
3626         int status = -ENOMEM;
3627
3628         res.fattr = nfs_alloc_fattr();
3629         if (res.fattr == NULL)
3630                 goto out;
3631
3632         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3633         if (IS_ERR(res.label)) {
3634                 status = PTR_ERR(res.label);
3635                 goto out;
3636         }
3637         arg.bitmask = nfs4_bitmask(server, res.label);
3638
3639         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3640         if (!status) {
3641                 update_changeattr(dir, &res.cinfo);
3642                 status = nfs_post_op_update_inode(inode, res.fattr);
3643                 if (!status)
3644                         nfs_setsecurity(inode, res.fattr, res.label);
3645         }
3646
3647
3648         nfs4_label_free(res.label);
3649
3650 out:
3651         nfs_free_fattr(res.fattr);
3652         return status;
3653 }
3654
3655 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3656 {
3657         struct nfs4_exception exception = { };
3658         int err;
3659         do {
3660                 err = nfs4_handle_exception(NFS_SERVER(inode),
3661                                 _nfs4_proc_link(inode, dir, name),
3662                                 &exception);
3663         } while (exception.retry);
3664         return err;
3665 }
3666
3667 struct nfs4_createdata {
3668         struct rpc_message msg;
3669         struct nfs4_create_arg arg;
3670         struct nfs4_create_res res;
3671         struct nfs_fh fh;
3672         struct nfs_fattr fattr;
3673         struct nfs4_label *label;
3674 };
3675
3676 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3677                 struct qstr *name, struct iattr *sattr, u32 ftype)
3678 {
3679         struct nfs4_createdata *data;
3680
3681         data = kzalloc(sizeof(*data), GFP_KERNEL);
3682         if (data != NULL) {
3683                 struct nfs_server *server = NFS_SERVER(dir);
3684
3685                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3686                 if (IS_ERR(data->label))
3687                         goto out_free;
3688
3689                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3690                 data->msg.rpc_argp = &data->arg;
3691                 data->msg.rpc_resp = &data->res;
3692                 data->arg.dir_fh = NFS_FH(dir);
3693                 data->arg.server = server;
3694                 data->arg.name = name;
3695                 data->arg.attrs = sattr;
3696                 data->arg.ftype = ftype;
3697                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3698                 data->res.server = server;
3699                 data->res.fh = &data->fh;
3700                 data->res.fattr = &data->fattr;
3701                 data->res.label = data->label;
3702                 nfs_fattr_init(data->res.fattr);
3703         }
3704         return data;
3705 out_free:
3706         kfree(data);
3707         return NULL;
3708 }
3709
3710 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3711 {
3712         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3713                                     &data->arg.seq_args, &data->res.seq_res, 1);
3714         if (status == 0) {
3715                 update_changeattr(dir, &data->res.dir_cinfo);
3716                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3717         }
3718         return status;
3719 }
3720
3721 static void nfs4_free_createdata(struct nfs4_createdata *data)
3722 {
3723         nfs4_label_free(data->label);
3724         kfree(data);
3725 }
3726
3727 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3728                 struct page *page, unsigned int len, struct iattr *sattr,
3729                 struct nfs4_label *label)
3730 {
3731         struct nfs4_createdata *data;
3732         int status = -ENAMETOOLONG;
3733
3734         if (len > NFS4_MAXPATHLEN)
3735                 goto out;
3736
3737         status = -ENOMEM;
3738         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3739         if (data == NULL)
3740                 goto out;
3741
3742         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3743         data->arg.u.symlink.pages = &page;
3744         data->arg.u.symlink.len = len;
3745         data->arg.label = label;
3746
3747         status = nfs4_do_create(dir, dentry, data);
3748
3749         nfs4_free_createdata(data);
3750 out:
3751         return status;
3752 }
3753
3754 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3755                 struct page *page, unsigned int len, struct iattr *sattr)
3756 {
3757         struct nfs4_exception exception = { };
3758         struct nfs4_label l, *label = NULL;
3759         int err;
3760
3761         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3762
3763         do {
3764                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3765                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3766                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3767                                 &exception);
3768         } while (exception.retry);
3769
3770         nfs4_label_release_security(label);
3771         return err;
3772 }
3773
3774 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3775                 struct iattr *sattr, struct nfs4_label *label)
3776 {
3777         struct nfs4_createdata *data;
3778         int status = -ENOMEM;
3779
3780         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3781         if (data == NULL)
3782                 goto out;
3783
3784         data->arg.label = label;
3785         status = nfs4_do_create(dir, dentry, data);
3786
3787         nfs4_free_createdata(data);
3788 out:
3789         return status;
3790 }
3791
3792 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3793                 struct iattr *sattr)
3794 {
3795         struct nfs4_exception exception = { };
3796         struct nfs4_label l, *label = NULL;
3797         int err;
3798
3799         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3800
3801         sattr->ia_mode &= ~current_umask();
3802         do {
3803                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3804                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3805                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3806                                 &exception);
3807         } while (exception.retry);
3808         nfs4_label_release_security(label);
3809
3810         return err;
3811 }
3812
3813 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3814                 u64 cookie, struct page **pages, unsigned int count, int plus)
3815 {
3816         struct inode            *dir = dentry->d_inode;
3817         struct nfs4_readdir_arg args = {
3818                 .fh = NFS_FH(dir),
3819                 .pages = pages,
3820                 .pgbase = 0,
3821                 .count = count,
3822                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3823                 .plus = plus,
3824         };
3825         struct nfs4_readdir_res res;
3826         struct rpc_message msg = {
3827                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3828                 .rpc_argp = &args,
3829                 .rpc_resp = &res,
3830                 .rpc_cred = cred,
3831         };
3832         int                     status;
3833
3834         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3835                         dentry,
3836                         (unsigned long long)cookie);
3837         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3838         res.pgbase = args.pgbase;
3839         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3840         if (status >= 0) {
3841                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3842                 status += args.pgbase;
3843         }
3844
3845         nfs_invalidate_atime(dir);
3846
3847         dprintk("%s: returns %d\n", __func__, status);
3848         return status;
3849 }
3850
3851 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3852                 u64 cookie, struct page **pages, unsigned int count, int plus)
3853 {
3854         struct nfs4_exception exception = { };
3855         int err;
3856         do {
3857                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3858                                 pages, count, plus);
3859                 trace_nfs4_readdir(dentry->d_inode, err);
3860                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3861                                 &exception);
3862         } while (exception.retry);
3863         return err;
3864 }
3865
3866 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3867                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3868 {
3869         struct nfs4_createdata *data;
3870         int mode = sattr->ia_mode;
3871         int status = -ENOMEM;
3872
3873         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3874         if (data == NULL)
3875                 goto out;
3876
3877         if (S_ISFIFO(mode))
3878                 data->arg.ftype = NF4FIFO;
3879         else if (S_ISBLK(mode)) {
3880                 data->arg.ftype = NF4BLK;
3881                 data->arg.u.device.specdata1 = MAJOR(rdev);
3882                 data->arg.u.device.specdata2 = MINOR(rdev);
3883         }
3884         else if (S_ISCHR(mode)) {
3885                 data->arg.ftype = NF4CHR;
3886                 data->arg.u.device.specdata1 = MAJOR(rdev);
3887                 data->arg.u.device.specdata2 = MINOR(rdev);
3888         } else if (!S_ISSOCK(mode)) {
3889                 status = -EINVAL;
3890                 goto out_free;
3891         }
3892
3893         data->arg.label = label;
3894         status = nfs4_do_create(dir, dentry, data);
3895 out_free:
3896         nfs4_free_createdata(data);
3897 out:
3898         return status;
3899 }
3900
3901 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3902                 struct iattr *sattr, dev_t rdev)
3903 {
3904         struct nfs4_exception exception = { };
3905         struct nfs4_label l, *label = NULL;
3906         int err;
3907
3908         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3909
3910         sattr->ia_mode &= ~current_umask();
3911         do {
3912                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3913                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3914                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3915                                 &exception);
3916         } while (exception.retry);
3917
3918         nfs4_label_release_security(label);
3919
3920         return err;
3921 }
3922
3923 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3924                  struct nfs_fsstat *fsstat)
3925 {
3926         struct nfs4_statfs_arg args = {
3927                 .fh = fhandle,
3928                 .bitmask = server->attr_bitmask,
3929         };
3930         struct nfs4_statfs_res res = {
3931                 .fsstat = fsstat,
3932         };
3933         struct rpc_message msg = {
3934                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3935                 .rpc_argp = &args,
3936                 .rpc_resp = &res,
3937         };
3938
3939         nfs_fattr_init(fsstat->fattr);
3940         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3941 }
3942
3943 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3944 {
3945         struct nfs4_exception exception = { };
3946         int err;
3947         do {
3948                 err = nfs4_handle_exception(server,
3949                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3950                                 &exception);
3951         } while (exception.retry);
3952         return err;
3953 }
3954
3955 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3956                 struct nfs_fsinfo *fsinfo)
3957 {
3958         struct nfs4_fsinfo_arg args = {
3959                 .fh = fhandle,
3960                 .bitmask = server->attr_bitmask,
3961         };
3962         struct nfs4_fsinfo_res res = {
3963                 .fsinfo = fsinfo,
3964         };
3965         struct rpc_message msg = {
3966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3967                 .rpc_argp = &args,
3968                 .rpc_resp = &res,
3969         };
3970
3971         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3972 }
3973
3974 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3975 {
3976         struct nfs4_exception exception = { };
3977         unsigned long now = jiffies;
3978         int err;
3979
3980         do {
3981                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3982                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3983                 if (err == 0) {
3984                         struct nfs_client *clp = server->nfs_client;
3985
3986                         spin_lock(&clp->cl_lock);
3987                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3988                         clp->cl_last_renewal = now;
3989                         spin_unlock(&clp->cl_lock);
3990                         break;
3991                 }
3992                 err = nfs4_handle_exception(server, err, &exception);
3993         } while (exception.retry);
3994         return err;
3995 }
3996
3997 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3998 {
3999         int error;
4000
4001         nfs_fattr_init(fsinfo->fattr);
4002         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4003         if (error == 0) {
4004                 /* block layout checks this! */
4005                 server->pnfs_blksize = fsinfo->blksize;
4006                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4007         }
4008
4009         return error;
4010 }
4011
4012 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4013                 struct nfs_pathconf *pathconf)
4014 {
4015         struct nfs4_pathconf_arg args = {
4016                 .fh = fhandle,
4017                 .bitmask = server->attr_bitmask,
4018         };
4019         struct nfs4_pathconf_res res = {
4020                 .pathconf = pathconf,
4021         };
4022         struct rpc_message msg = {
4023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4024                 .rpc_argp = &args,
4025                 .rpc_resp = &res,
4026         };
4027
4028         /* None of the pathconf attributes are mandatory to implement */
4029         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4030                 memset(pathconf, 0, sizeof(*pathconf));
4031                 return 0;
4032         }
4033
4034         nfs_fattr_init(pathconf->fattr);
4035         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4036 }
4037
4038 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4039                 struct nfs_pathconf *pathconf)
4040 {
4041         struct nfs4_exception exception = { };
4042         int err;
4043
4044         do {
4045                 err = nfs4_handle_exception(server,
4046                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4047                                 &exception);
4048         } while (exception.retry);
4049         return err;
4050 }
4051
4052 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4053                 const struct nfs_open_context *ctx,
4054                 const struct nfs_lock_context *l_ctx,
4055                 fmode_t fmode)
4056 {
4057         const struct nfs_lockowner *lockowner = NULL;
4058
4059         if (l_ctx != NULL)
4060                 lockowner = &l_ctx->lockowner;
4061         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4062 }
4063 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4064
4065 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4066                 const struct nfs_open_context *ctx,
4067                 const struct nfs_lock_context *l_ctx,
4068                 fmode_t fmode)
4069 {
4070         nfs4_stateid current_stateid;
4071
4072         /* If the current stateid represents a lost lock, then exit */
4073         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4074                 return true;
4075         return nfs4_stateid_match(stateid, &current_stateid);
4076 }
4077
4078 static bool nfs4_error_stateid_expired(int err)
4079 {
4080         switch (err) {
4081         case -NFS4ERR_DELEG_REVOKED:
4082         case -NFS4ERR_ADMIN_REVOKED:
4083         case -NFS4ERR_BAD_STATEID:
4084         case -NFS4ERR_STALE_STATEID:
4085         case -NFS4ERR_OLD_STATEID:
4086         case -NFS4ERR_OPENMODE:
4087         case -NFS4ERR_EXPIRED:
4088                 return true;
4089         }
4090         return false;
4091 }
4092
4093 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4094 {
4095         nfs_invalidate_atime(hdr->inode);
4096 }
4097
4098 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4099 {
4100         struct nfs_server *server = NFS_SERVER(hdr->inode);
4101
4102         trace_nfs4_read(hdr, task->tk_status);
4103         if (nfs4_async_handle_error(task, server,
4104                                     hdr->args.context->state) == -EAGAIN) {
4105                 rpc_restart_call_prepare(task);
4106                 return -EAGAIN;
4107         }
4108
4109         __nfs4_read_done_cb(hdr);
4110         if (task->tk_status > 0)
4111                 renew_lease(server, hdr->timestamp);
4112         return 0;
4113 }
4114
4115 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4116                 struct nfs_pgio_args *args)
4117 {
4118
4119         if (!nfs4_error_stateid_expired(task->tk_status) ||
4120                 nfs4_stateid_is_current(&args->stateid,
4121                                 args->context,
4122                                 args->lock_context,
4123                                 FMODE_READ))
4124                 return false;
4125         rpc_restart_call_prepare(task);
4126         return true;
4127 }
4128
4129 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4130 {
4131
4132         dprintk("--> %s\n", __func__);
4133
4134         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4135                 return -EAGAIN;
4136         if (nfs4_read_stateid_changed(task, &hdr->args))
4137                 return -EAGAIN;
4138         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4139                                     nfs4_read_done_cb(task, hdr);
4140 }
4141
4142 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4143                                  struct rpc_message *msg)
4144 {
4145         hdr->timestamp   = jiffies;
4146         hdr->pgio_done_cb = nfs4_read_done_cb;
4147         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4148         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4149 }
4150
4151 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4152                                       struct nfs_pgio_header *hdr)
4153 {
4154         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4155                         &hdr->args.seq_args,
4156                         &hdr->res.seq_res,
4157                         task))
4158                 return 0;
4159         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4160                                 hdr->args.lock_context,
4161                                 hdr->rw_ops->rw_mode) == -EIO)
4162                 return -EIO;
4163         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4164                 return -EIO;
4165         return 0;
4166 }
4167
4168 static int nfs4_write_done_cb(struct rpc_task *task,
4169                               struct nfs_pgio_header *hdr)
4170 {
4171         struct inode *inode = hdr->inode;
4172
4173         trace_nfs4_write(hdr, task->tk_status);
4174         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4175                                     hdr->args.context->state) == -EAGAIN) {
4176                 rpc_restart_call_prepare(task);
4177                 return -EAGAIN;
4178         }
4179         if (task->tk_status >= 0) {
4180                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4181                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4182         }
4183         return 0;
4184 }
4185
4186 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4187                 struct nfs_pgio_args *args)
4188 {
4189
4190         if (!nfs4_error_stateid_expired(task->tk_status) ||
4191                 nfs4_stateid_is_current(&args->stateid,
4192                                 args->context,
4193                                 args->lock_context,
4194                                 FMODE_WRITE))
4195                 return false;
4196         rpc_restart_call_prepare(task);
4197         return true;
4198 }
4199
4200 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4201 {
4202         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4203                 return -EAGAIN;
4204         if (nfs4_write_stateid_changed(task, &hdr->args))
4205                 return -EAGAIN;
4206         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4207                 nfs4_write_done_cb(task, hdr);
4208 }
4209
4210 static
4211 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4212 {
4213         /* Don't request attributes for pNFS or O_DIRECT writes */
4214         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4215                 return false;
4216         /* Otherwise, request attributes if and only if we don't hold
4217          * a delegation
4218          */
4219         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4220 }
4221
4222 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4223                                   struct rpc_message *msg)
4224 {
4225         struct nfs_server *server = NFS_SERVER(hdr->inode);
4226
4227         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4228                 hdr->args.bitmask = NULL;
4229                 hdr->res.fattr = NULL;
4230         } else
4231                 hdr->args.bitmask = server->cache_consistency_bitmask;
4232
4233         if (!hdr->pgio_done_cb)
4234                 hdr->pgio_done_cb = nfs4_write_done_cb;
4235         hdr->res.server = server;
4236         hdr->timestamp   = jiffies;
4237
4238         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4239         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4240 }
4241
4242 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4243 {
4244         nfs4_setup_sequence(NFS_SERVER(data->inode),
4245                         &data->args.seq_args,
4246                         &data->res.seq_res,
4247                         task);
4248 }
4249
4250 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4251 {
4252         struct inode *inode = data->inode;
4253
4254         trace_nfs4_commit(data, task->tk_status);
4255         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4256                 rpc_restart_call_prepare(task);
4257                 return -EAGAIN;
4258         }
4259         return 0;
4260 }
4261
4262 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4263 {
4264         if (!nfs4_sequence_done(task, &data->res.seq_res))
4265                 return -EAGAIN;
4266         return data->commit_done_cb(task, data);
4267 }
4268
4269 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4270 {
4271         struct nfs_server *server = NFS_SERVER(data->inode);
4272
4273         if (data->commit_done_cb == NULL)
4274                 data->commit_done_cb = nfs4_commit_done_cb;
4275         data->res.server = server;
4276         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4277         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4278 }
4279
4280 struct nfs4_renewdata {
4281         struct nfs_client       *client;
4282         unsigned long           timestamp;
4283 };
4284
4285 /*
4286  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4287  * standalone procedure for queueing an asynchronous RENEW.
4288  */
4289 static void nfs4_renew_release(void *calldata)
4290 {
4291         struct nfs4_renewdata *data = calldata;
4292         struct nfs_client *clp = data->client;
4293
4294         if (atomic_read(&clp->cl_count) > 1)
4295                 nfs4_schedule_state_renewal(clp);
4296         nfs_put_client(clp);
4297         kfree(data);
4298 }
4299
4300 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4301 {
4302         struct nfs4_renewdata *data = calldata;
4303         struct nfs_client *clp = data->client;
4304         unsigned long timestamp = data->timestamp;
4305
4306         trace_nfs4_renew_async(clp, task->tk_status);
4307         switch (task->tk_status) {
4308         case 0:
4309                 break;
4310         case -NFS4ERR_LEASE_MOVED:
4311                 nfs4_schedule_lease_moved_recovery(clp);
4312                 break;
4313         default:
4314                 /* Unless we're shutting down, schedule state recovery! */
4315                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4316                         return;
4317                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4318                         nfs4_schedule_lease_recovery(clp);
4319                         return;
4320                 }
4321                 nfs4_schedule_path_down_recovery(clp);
4322         }
4323         do_renew_lease(clp, timestamp);
4324 }
4325
4326 static const struct rpc_call_ops nfs4_renew_ops = {
4327         .rpc_call_done = nfs4_renew_done,
4328         .rpc_release = nfs4_renew_release,
4329 };
4330
4331 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4332 {
4333         struct rpc_message msg = {
4334                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4335                 .rpc_argp       = clp,
4336                 .rpc_cred       = cred,
4337         };
4338         struct nfs4_renewdata *data;
4339
4340         if (renew_flags == 0)
4341                 return 0;
4342         if (!atomic_inc_not_zero(&clp->cl_count))
4343                 return -EIO;
4344         data = kmalloc(sizeof(*data), GFP_NOFS);
4345         if (data == NULL)
4346                 return -ENOMEM;
4347         data->client = clp;
4348         data->timestamp = jiffies;
4349         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4350                         &nfs4_renew_ops, data);
4351 }
4352
4353 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4354 {
4355         struct rpc_message msg = {
4356                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4357                 .rpc_argp       = clp,
4358                 .rpc_cred       = cred,
4359         };
4360         unsigned long now = jiffies;
4361         int status;
4362
4363         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4364         if (status < 0)
4365                 return status;
4366         do_renew_lease(clp, now);
4367         return 0;
4368 }
4369
4370 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4371 {
4372         return server->caps & NFS_CAP_ACLS;
4373 }
4374
4375 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4376  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4377  * the stack.
4378  */
4379 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4380
4381 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4382                 struct page **pages, unsigned int *pgbase)
4383 {
4384         struct page *newpage, **spages;
4385         int rc = 0;
4386         size_t len;
4387         spages = pages;
4388
4389         do {
4390                 len = min_t(size_t, PAGE_SIZE, buflen);
4391                 newpage = alloc_page(GFP_KERNEL);
4392
4393                 if (newpage == NULL)
4394                         goto unwind;
4395                 memcpy(page_address(newpage), buf, len);
4396                 buf += len;
4397                 buflen -= len;
4398                 *pages++ = newpage;
4399                 rc++;
4400         } while (buflen != 0);
4401
4402         return rc;
4403
4404 unwind:
4405         for(; rc > 0; rc--)
4406                 __free_page(spages[rc-1]);
4407         return -ENOMEM;
4408 }
4409
4410 struct nfs4_cached_acl {
4411         int cached;
4412         size_t len;
4413         char data[0];
4414 };
4415
4416 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4417 {
4418         struct nfs_inode *nfsi = NFS_I(inode);
4419
4420         spin_lock(&inode->i_lock);
4421         kfree(nfsi->nfs4_acl);
4422         nfsi->nfs4_acl = acl;
4423         spin_unlock(&inode->i_lock);
4424 }
4425
4426 static void nfs4_zap_acl_attr(struct inode *inode)
4427 {
4428         nfs4_set_cached_acl(inode, NULL);
4429 }
4430
4431 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4432 {
4433         struct nfs_inode *nfsi = NFS_I(inode);
4434         struct nfs4_cached_acl *acl;
4435         int ret = -ENOENT;
4436
4437         spin_lock(&inode->i_lock);
4438         acl = nfsi->nfs4_acl;
4439         if (acl == NULL)
4440                 goto out;
4441         if (buf == NULL) /* user is just asking for length */
4442                 goto out_len;
4443         if (acl->cached == 0)
4444                 goto out;
4445         ret = -ERANGE; /* see getxattr(2) man page */
4446         if (acl->len > buflen)
4447                 goto out;
4448         memcpy(buf, acl->data, acl->len);
4449 out_len:
4450         ret = acl->len;
4451 out:
4452         spin_unlock(&inode->i_lock);
4453         return ret;
4454 }
4455
4456 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4457 {
4458         struct nfs4_cached_acl *acl;
4459         size_t buflen = sizeof(*acl) + acl_len;
4460
4461         if (buflen <= PAGE_SIZE) {
4462                 acl = kmalloc(buflen, GFP_KERNEL);
4463                 if (acl == NULL)
4464                         goto out;
4465                 acl->cached = 1;
4466                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4467         } else {
4468                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4469                 if (acl == NULL)
4470                         goto out;
4471                 acl->cached = 0;
4472         }
4473         acl->len = acl_len;
4474 out:
4475         nfs4_set_cached_acl(inode, acl);
4476 }
4477
4478 /*
4479  * The getxattr API returns the required buffer length when called with a
4480  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4481  * the required buf.  On a NULL buf, we send a page of data to the server
4482  * guessing that the ACL request can be serviced by a page. If so, we cache
4483  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4484  * the cache. If not so, we throw away the page, and cache the required
4485  * length. The next getxattr call will then produce another round trip to
4486  * the server, this time with the input buf of the required size.
4487  */
4488 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4489 {
4490         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4491         struct nfs_getaclargs args = {
4492                 .fh = NFS_FH(inode),
4493                 .acl_pages = pages,
4494                 .acl_len = buflen,
4495         };
4496         struct nfs_getaclres res = {
4497                 .acl_len = buflen,
4498         };
4499         struct rpc_message msg = {
4500                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4501                 .rpc_argp = &args,
4502                 .rpc_resp = &res,
4503         };
4504         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4505         int ret = -ENOMEM, i;
4506
4507         /* As long as we're doing a round trip to the server anyway,
4508          * let's be prepared for a page of acl data. */
4509         if (npages == 0)
4510                 npages = 1;
4511         if (npages > ARRAY_SIZE(pages))
4512                 return -ERANGE;
4513
4514         for (i = 0; i < npages; i++) {
4515                 pages[i] = alloc_page(GFP_KERNEL);
4516                 if (!pages[i])
4517                         goto out_free;
4518         }
4519
4520         /* for decoding across pages */
4521         res.acl_scratch = alloc_page(GFP_KERNEL);
4522         if (!res.acl_scratch)
4523                 goto out_free;
4524
4525         args.acl_len = npages * PAGE_SIZE;
4526         args.acl_pgbase = 0;
4527
4528         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4529                 __func__, buf, buflen, npages, args.acl_len);
4530         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4531                              &msg, &args.seq_args, &res.seq_res, 0);
4532         if (ret)
4533                 goto out_free;
4534
4535         /* Handle the case where the passed-in buffer is too short */
4536         if (res.acl_flags & NFS4_ACL_TRUNC) {
4537                 /* Did the user only issue a request for the acl length? */
4538                 if (buf == NULL)
4539                         goto out_ok;
4540                 ret = -ERANGE;
4541                 goto out_free;
4542         }
4543         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4544         if (buf) {
4545                 if (res.acl_len > buflen) {
4546                         ret = -ERANGE;
4547                         goto out_free;
4548                 }
4549                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4550         }
4551 out_ok:
4552         ret = res.acl_len;
4553 out_free:
4554         for (i = 0; i < npages; i++)
4555                 if (pages[i])
4556                         __free_page(pages[i]);
4557         if (res.acl_scratch)
4558                 __free_page(res.acl_scratch);
4559         return ret;
4560 }
4561
4562 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4563 {
4564         struct nfs4_exception exception = { };
4565         ssize_t ret;
4566         do {
4567                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4568                 trace_nfs4_get_acl(inode, ret);
4569                 if (ret >= 0)
4570                         break;
4571                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4572         } while (exception.retry);
4573         return ret;
4574 }
4575
4576 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4577 {
4578         struct nfs_server *server = NFS_SERVER(inode);
4579         int ret;
4580
4581         if (!nfs4_server_supports_acls(server))
4582                 return -EOPNOTSUPP;
4583         ret = nfs_revalidate_inode(server, inode);
4584         if (ret < 0)
4585                 return ret;
4586         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4587                 nfs_zap_acl_cache(inode);
4588         ret = nfs4_read_cached_acl(inode, buf, buflen);
4589         if (ret != -ENOENT)
4590                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4591                  * but no cached acl data, just the acl length */
4592                 return ret;
4593         return nfs4_get_acl_uncached(inode, buf, buflen);
4594 }
4595
4596 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4597 {
4598         struct nfs_server *server = NFS_SERVER(inode);
4599         struct page *pages[NFS4ACL_MAXPAGES];
4600         struct nfs_setaclargs arg = {
4601                 .fh             = NFS_FH(inode),
4602                 .acl_pages      = pages,
4603                 .acl_len        = buflen,
4604         };
4605         struct nfs_setaclres res;
4606         struct rpc_message msg = {
4607                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4608                 .rpc_argp       = &arg,
4609                 .rpc_resp       = &res,
4610         };
4611         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4612         int ret, i;
4613
4614         if (!nfs4_server_supports_acls(server))
4615                 return -EOPNOTSUPP;
4616         if (npages > ARRAY_SIZE(pages))
4617                 return -ERANGE;
4618         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4619         if (i < 0)
4620                 return i;
4621         nfs4_inode_return_delegation(inode);
4622         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4623
4624         /*
4625          * Free each page after tx, so the only ref left is
4626          * held by the network stack
4627          */
4628         for (; i > 0; i--)
4629                 put_page(pages[i-1]);
4630
4631         /*
4632          * Acl update can result in inode attribute update.
4633          * so mark the attribute cache invalid.
4634          */
4635         spin_lock(&inode->i_lock);
4636         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4637         spin_unlock(&inode->i_lock);
4638         nfs_access_zap_cache(inode);
4639         nfs_zap_acl_cache(inode);
4640         return ret;
4641 }
4642
4643 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4644 {
4645         struct nfs4_exception exception = { };
4646         int err;
4647         do {
4648                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4649                 trace_nfs4_set_acl(inode, err);
4650                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4651                                 &exception);
4652         } while (exception.retry);
4653         return err;
4654 }
4655
4656 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4657 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4658                                         size_t buflen)
4659 {
4660         struct nfs_server *server = NFS_SERVER(inode);
4661         struct nfs_fattr fattr;
4662         struct nfs4_label label = {0, 0, buflen, buf};
4663
4664         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4665         struct nfs4_getattr_arg arg = {
4666                 .fh             = NFS_FH(inode),
4667                 .bitmask        = bitmask,
4668         };
4669         struct nfs4_getattr_res res = {
4670                 .fattr          = &fattr,
4671                 .label          = &label,
4672                 .server         = server,
4673         };
4674         struct rpc_message msg = {
4675                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4676                 .rpc_argp       = &arg,
4677                 .rpc_resp       = &res,
4678         };
4679         int ret;
4680
4681         nfs_fattr_init(&fattr);
4682
4683         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4684         if (ret)
4685                 return ret;
4686         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4687                 return -ENOENT;
4688         if (buflen < label.len)
4689                 return -ERANGE;
4690         return 0;
4691 }
4692
4693 static int nfs4_get_security_label(struct inode *inode, void *buf,
4694                                         size_t buflen)
4695 {
4696         struct nfs4_exception exception = { };
4697         int err;
4698
4699         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4700                 return -EOPNOTSUPP;
4701
4702         do {
4703                 err = _nfs4_get_security_label(inode, buf, buflen);
4704                 trace_nfs4_get_security_label(inode, err);
4705                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4706                                 &exception);
4707         } while (exception.retry);
4708         return err;
4709 }
4710
4711 static int _nfs4_do_set_security_label(struct inode *inode,
4712                 struct nfs4_label *ilabel,
4713                 struct nfs_fattr *fattr,
4714                 struct nfs4_label *olabel)
4715 {
4716
4717         struct iattr sattr = {0};
4718         struct nfs_server *server = NFS_SERVER(inode);
4719         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4720         struct nfs_setattrargs arg = {
4721                 .fh             = NFS_FH(inode),
4722                 .iap            = &sattr,
4723                 .server         = server,
4724                 .bitmask        = bitmask,
4725                 .label          = ilabel,
4726         };
4727         struct nfs_setattrres res = {
4728                 .fattr          = fattr,
4729                 .label          = olabel,
4730                 .server         = server,
4731         };
4732         struct rpc_message msg = {
4733                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4734                 .rpc_argp       = &arg,
4735                 .rpc_resp       = &res,
4736         };
4737         int status;
4738
4739         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4740
4741         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4742         if (status)
4743                 dprintk("%s failed: %d\n", __func__, status);
4744
4745         return status;
4746 }
4747
4748 static int nfs4_do_set_security_label(struct inode *inode,
4749                 struct nfs4_label *ilabel,
4750                 struct nfs_fattr *fattr,
4751                 struct nfs4_label *olabel)
4752 {
4753         struct nfs4_exception exception = { };
4754         int err;
4755
4756         do {
4757                 err = _nfs4_do_set_security_label(inode, ilabel,
4758                                 fattr, olabel);
4759                 trace_nfs4_set_security_label(inode, err);
4760                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4761                                 &exception);
4762         } while (exception.retry);
4763         return err;
4764 }
4765
4766 static int
4767 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4768 {
4769         struct nfs4_label ilabel, *olabel = NULL;
4770         struct nfs_fattr fattr;
4771         struct rpc_cred *cred;
4772         struct inode *inode = dentry->d_inode;
4773         int status;
4774
4775         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4776                 return -EOPNOTSUPP;
4777
4778         nfs_fattr_init(&fattr);
4779
4780         ilabel.pi = 0;
4781         ilabel.lfs = 0;
4782         ilabel.label = (char *)buf;
4783         ilabel.len = buflen;
4784
4785         cred = rpc_lookup_cred();
4786         if (IS_ERR(cred))
4787                 return PTR_ERR(cred);
4788
4789         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4790         if (IS_ERR(olabel)) {
4791                 status = -PTR_ERR(olabel);
4792                 goto out;
4793         }
4794
4795         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4796         if (status == 0)
4797                 nfs_setsecurity(inode, &fattr, olabel);
4798
4799         nfs4_label_free(olabel);
4800 out:
4801         put_rpccred(cred);
4802         return status;
4803 }
4804 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4805
4806
4807 static int
4808 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4809 {
4810         struct nfs_client *clp = server->nfs_client;
4811
4812         if (task->tk_status >= 0)
4813                 return 0;
4814         switch(task->tk_status) {
4815                 case -NFS4ERR_DELEG_REVOKED:
4816                 case -NFS4ERR_ADMIN_REVOKED:
4817                 case -NFS4ERR_BAD_STATEID:
4818                         if (state == NULL)
4819                                 break;
4820                         nfs_remove_bad_delegation(state->inode);
4821                 case -NFS4ERR_OPENMODE:
4822                         if (state == NULL)
4823                                 break;
4824                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4825                                 goto recovery_failed;
4826                         goto wait_on_recovery;
4827                 case -NFS4ERR_EXPIRED:
4828                         if (state != NULL) {
4829                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4830                                         goto recovery_failed;
4831                         }
4832                 case -NFS4ERR_STALE_STATEID:
4833                 case -NFS4ERR_STALE_CLIENTID:
4834                         nfs4_schedule_lease_recovery(clp);
4835                         goto wait_on_recovery;
4836                 case -NFS4ERR_MOVED:
4837                         if (nfs4_schedule_migration_recovery(server) < 0)
4838                                 goto recovery_failed;
4839                         goto wait_on_recovery;
4840                 case -NFS4ERR_LEASE_MOVED:
4841                         nfs4_schedule_lease_moved_recovery(clp);
4842                         goto wait_on_recovery;
4843 #if defined(CONFIG_NFS_V4_1)
4844                 case -NFS4ERR_BADSESSION:
4845                 case -NFS4ERR_BADSLOT:
4846                 case -NFS4ERR_BAD_HIGH_SLOT:
4847                 case -NFS4ERR_DEADSESSION:
4848                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4849                 case -NFS4ERR_SEQ_FALSE_RETRY:
4850                 case -NFS4ERR_SEQ_MISORDERED:
4851                         dprintk("%s ERROR %d, Reset session\n", __func__,
4852                                 task->tk_status);
4853                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4854                         goto wait_on_recovery;
4855 #endif /* CONFIG_NFS_V4_1 */
4856                 case -NFS4ERR_DELAY:
4857                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4858                 case -NFS4ERR_GRACE:
4859                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4860                 case -NFS4ERR_RETRY_UNCACHED_REP:
4861                 case -NFS4ERR_OLD_STATEID:
4862                         goto restart_call;
4863         }
4864         task->tk_status = nfs4_map_errors(task->tk_status);
4865         return 0;
4866 recovery_failed:
4867         task->tk_status = -EIO;
4868         return 0;
4869 wait_on_recovery:
4870         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4871         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4872                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4873         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4874                 goto recovery_failed;
4875 restart_call:
4876         task->tk_status = 0;
4877         return -EAGAIN;
4878 }
4879
4880 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4881                                     nfs4_verifier *bootverf)
4882 {
4883         __be32 verf[2];
4884
4885         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4886                 /* An impossible timestamp guarantees this value
4887                  * will never match a generated boot time. */
4888                 verf[0] = 0;
4889                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4890         } else {
4891                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4892                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4893                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4894         }
4895         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4896 }
4897
4898 static unsigned int
4899 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4900                                    char *buf, size_t len)
4901 {
4902         unsigned int result;
4903
4904         rcu_read_lock();
4905         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4906                                 clp->cl_ipaddr,
4907                                 rpc_peeraddr2str(clp->cl_rpcclient,
4908                                                         RPC_DISPLAY_ADDR),
4909                                 rpc_peeraddr2str(clp->cl_rpcclient,
4910                                                         RPC_DISPLAY_PROTO));
4911         rcu_read_unlock();
4912         return result;
4913 }
4914
4915 static unsigned int
4916 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4917                                 char *buf, size_t len)
4918 {
4919         const char *nodename = clp->cl_rpcclient->cl_nodename;
4920
4921         if (nfs4_client_id_uniquifier[0] != '\0')
4922                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4923                                 clp->rpc_ops->version,
4924                                 clp->cl_minorversion,
4925                                 nfs4_client_id_uniquifier,
4926                                 nodename);
4927         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4928                                 clp->rpc_ops->version, clp->cl_minorversion,
4929                                 nodename);
4930 }
4931
4932 /*
4933  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4934  * services.  Advertise one based on the address family of the
4935  * clientaddr.
4936  */
4937 static unsigned int
4938 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4939 {
4940         if (strchr(clp->cl_ipaddr, ':') != NULL)
4941                 return scnprintf(buf, len, "tcp6");
4942         else
4943                 return scnprintf(buf, len, "tcp");
4944 }
4945
4946 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4947 {
4948         struct nfs4_setclientid *sc = calldata;
4949
4950         if (task->tk_status == 0)
4951                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4952 }
4953
4954 static const struct rpc_call_ops nfs4_setclientid_ops = {
4955         .rpc_call_done = nfs4_setclientid_done,
4956 };
4957
4958 /**
4959  * nfs4_proc_setclientid - Negotiate client ID
4960  * @clp: state data structure
4961  * @program: RPC program for NFSv4 callback service
4962  * @port: IP port number for NFS4 callback service
4963  * @cred: RPC credential to use for this call
4964  * @res: where to place the result
4965  *
4966  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4967  */
4968 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4969                 unsigned short port, struct rpc_cred *cred,
4970                 struct nfs4_setclientid_res *res)
4971 {
4972         nfs4_verifier sc_verifier;
4973         struct nfs4_setclientid setclientid = {
4974                 .sc_verifier = &sc_verifier,
4975                 .sc_prog = program,
4976                 .sc_cb_ident = clp->cl_cb_ident,
4977         };
4978         struct rpc_message msg = {
4979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4980                 .rpc_argp = &setclientid,
4981                 .rpc_resp = res,
4982                 .rpc_cred = cred,
4983         };
4984         struct rpc_task *task;
4985         struct rpc_task_setup task_setup_data = {
4986                 .rpc_client = clp->cl_rpcclient,
4987                 .rpc_message = &msg,
4988                 .callback_ops = &nfs4_setclientid_ops,
4989                 .callback_data = &setclientid,
4990                 .flags = RPC_TASK_TIMEOUT,
4991         };
4992         int status;
4993
4994         /* nfs_client_id4 */
4995         nfs4_init_boot_verifier(clp, &sc_verifier);
4996         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4997                 setclientid.sc_name_len =
4998                                 nfs4_init_uniform_client_string(clp,
4999                                                 setclientid.sc_name,
5000                                                 sizeof(setclientid.sc_name));
5001         else
5002                 setclientid.sc_name_len =
5003                                 nfs4_init_nonuniform_client_string(clp,
5004                                                 setclientid.sc_name,
5005                                                 sizeof(setclientid.sc_name));
5006         /* cb_client4 */
5007         setclientid.sc_netid_len =
5008                                 nfs4_init_callback_netid(clp,
5009                                                 setclientid.sc_netid,
5010                                                 sizeof(setclientid.sc_netid));
5011         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5012                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5013                                 clp->cl_ipaddr, port >> 8, port & 255);
5014
5015         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5016                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5017                 setclientid.sc_name_len, setclientid.sc_name);
5018         task = rpc_run_task(&task_setup_data);
5019         if (IS_ERR(task)) {
5020                 status = PTR_ERR(task);
5021                 goto out;
5022         }
5023         status = task->tk_status;
5024         if (setclientid.sc_cred) {
5025                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5026                 put_rpccred(setclientid.sc_cred);
5027         }
5028         rpc_put_task(task);
5029 out:
5030         trace_nfs4_setclientid(clp, status);
5031         dprintk("NFS reply setclientid: %d\n", status);
5032         return status;
5033 }
5034
5035 /**
5036  * nfs4_proc_setclientid_confirm - Confirm client ID
5037  * @clp: state data structure
5038  * @res: result of a previous SETCLIENTID
5039  * @cred: RPC credential to use for this call
5040  *
5041  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5042  */
5043 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5044                 struct nfs4_setclientid_res *arg,
5045                 struct rpc_cred *cred)
5046 {
5047         struct rpc_message msg = {
5048                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5049                 .rpc_argp = arg,
5050                 .rpc_cred = cred,
5051         };
5052         int status;
5053
5054         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5055                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5056                 clp->cl_clientid);
5057         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5058         trace_nfs4_setclientid_confirm(clp, status);
5059         dprintk("NFS reply setclientid_confirm: %d\n", status);
5060         return status;
5061 }
5062
5063 struct nfs4_delegreturndata {
5064         struct nfs4_delegreturnargs args;
5065         struct nfs4_delegreturnres res;
5066         struct nfs_fh fh;
5067         nfs4_stateid stateid;
5068         unsigned long timestamp;
5069         struct nfs_fattr fattr;
5070         int rpc_status;
5071         struct inode *inode;
5072         bool roc;
5073         u32 roc_barrier;
5074 };
5075
5076 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5077 {
5078         struct nfs4_delegreturndata *data = calldata;
5079
5080         if (!nfs4_sequence_done(task, &data->res.seq_res))
5081                 return;
5082
5083         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5084         switch (task->tk_status) {
5085         case 0:
5086                 renew_lease(data->res.server, data->timestamp);
5087         case -NFS4ERR_ADMIN_REVOKED:
5088         case -NFS4ERR_DELEG_REVOKED:
5089         case -NFS4ERR_BAD_STATEID:
5090         case -NFS4ERR_OLD_STATEID:
5091         case -NFS4ERR_STALE_STATEID:
5092         case -NFS4ERR_EXPIRED:
5093                 task->tk_status = 0;
5094                 if (data->roc)
5095                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5096                 break;
5097         default:
5098                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
5099                                 -EAGAIN) {
5100                         rpc_restart_call_prepare(task);
5101                         return;
5102                 }
5103         }
5104         data->rpc_status = task->tk_status;
5105 }
5106
5107 static void nfs4_delegreturn_release(void *calldata)
5108 {
5109         struct nfs4_delegreturndata *data = calldata;
5110
5111         if (data->roc)
5112                 pnfs_roc_release(data->inode);
5113         kfree(calldata);
5114 }
5115
5116 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5117 {
5118         struct nfs4_delegreturndata *d_data;
5119
5120         d_data = (struct nfs4_delegreturndata *)data;
5121
5122         if (d_data->roc &&
5123             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5124                 return;
5125
5126         nfs4_setup_sequence(d_data->res.server,
5127                         &d_data->args.seq_args,
5128                         &d_data->res.seq_res,
5129                         task);
5130 }
5131
5132 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5133         .rpc_call_prepare = nfs4_delegreturn_prepare,
5134         .rpc_call_done = nfs4_delegreturn_done,
5135         .rpc_release = nfs4_delegreturn_release,
5136 };
5137
5138 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5139 {
5140         struct nfs4_delegreturndata *data;
5141         struct nfs_server *server = NFS_SERVER(inode);
5142         struct rpc_task *task;
5143         struct rpc_message msg = {
5144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5145                 .rpc_cred = cred,
5146         };
5147         struct rpc_task_setup task_setup_data = {
5148                 .rpc_client = server->client,
5149                 .rpc_message = &msg,
5150                 .callback_ops = &nfs4_delegreturn_ops,
5151                 .flags = RPC_TASK_ASYNC,
5152         };
5153         int status = 0;
5154
5155         data = kzalloc(sizeof(*data), GFP_NOFS);
5156         if (data == NULL)
5157                 return -ENOMEM;
5158         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5159         data->args.fhandle = &data->fh;
5160         data->args.stateid = &data->stateid;
5161         data->args.bitmask = server->cache_consistency_bitmask;
5162         nfs_copy_fh(&data->fh, NFS_FH(inode));
5163         nfs4_stateid_copy(&data->stateid, stateid);
5164         data->res.fattr = &data->fattr;
5165         data->res.server = server;
5166         nfs_fattr_init(data->res.fattr);
5167         data->timestamp = jiffies;
5168         data->rpc_status = 0;
5169         data->inode = inode;
5170         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5171                     pnfs_roc(inode) : false;
5172
5173         task_setup_data.callback_data = data;
5174         msg.rpc_argp = &data->args;
5175         msg.rpc_resp = &data->res;
5176         task = rpc_run_task(&task_setup_data);
5177         if (IS_ERR(task))
5178                 return PTR_ERR(task);
5179         if (!issync)
5180                 goto out;
5181         status = nfs4_wait_for_completion_rpc_task(task);
5182         if (status != 0)
5183                 goto out;
5184         status = data->rpc_status;
5185         if (status == 0)
5186                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5187         else
5188                 nfs_refresh_inode(inode, &data->fattr);
5189 out:
5190         rpc_put_task(task);
5191         return status;
5192 }
5193
5194 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5195 {
5196         struct nfs_server *server = NFS_SERVER(inode);
5197         struct nfs4_exception exception = { };
5198         int err;
5199         do {
5200                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5201                 trace_nfs4_delegreturn(inode, err);
5202                 switch (err) {
5203                         case -NFS4ERR_STALE_STATEID:
5204                         case -NFS4ERR_EXPIRED:
5205                         case 0:
5206                                 return 0;
5207                 }
5208                 err = nfs4_handle_exception(server, err, &exception);
5209         } while (exception.retry);
5210         return err;
5211 }
5212
5213 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5214 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5215
5216 /*
5217  * sleep, with exponential backoff, and retry the LOCK operation.
5218  */
5219 static unsigned long
5220 nfs4_set_lock_task_retry(unsigned long timeout)
5221 {
5222         freezable_schedule_timeout_killable_unsafe(timeout);
5223         timeout <<= 1;
5224         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5225                 return NFS4_LOCK_MAXTIMEOUT;
5226         return timeout;
5227 }
5228
5229 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5230 {
5231         struct inode *inode = state->inode;
5232         struct nfs_server *server = NFS_SERVER(inode);
5233         struct nfs_client *clp = server->nfs_client;
5234         struct nfs_lockt_args arg = {
5235                 .fh = NFS_FH(inode),
5236                 .fl = request,
5237         };
5238         struct nfs_lockt_res res = {
5239                 .denied = request,
5240         };
5241         struct rpc_message msg = {
5242                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5243                 .rpc_argp       = &arg,
5244                 .rpc_resp       = &res,
5245                 .rpc_cred       = state->owner->so_cred,
5246         };
5247         struct nfs4_lock_state *lsp;
5248         int status;
5249
5250         arg.lock_owner.clientid = clp->cl_clientid;
5251         status = nfs4_set_lock_state(state, request);
5252         if (status != 0)
5253                 goto out;
5254         lsp = request->fl_u.nfs4_fl.owner;
5255         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5256         arg.lock_owner.s_dev = server->s_dev;
5257         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5258         switch (status) {
5259                 case 0:
5260                         request->fl_type = F_UNLCK;
5261                         break;
5262                 case -NFS4ERR_DENIED:
5263                         status = 0;
5264         }
5265         request->fl_ops->fl_release_private(request);
5266         request->fl_ops = NULL;
5267 out:
5268         return status;
5269 }
5270
5271 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5272 {
5273         struct nfs4_exception exception = { };
5274         int err;
5275
5276         do {
5277                 err = _nfs4_proc_getlk(state, cmd, request);
5278                 trace_nfs4_get_lock(request, state, cmd, err);
5279                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5280                                 &exception);
5281         } while (exception.retry);
5282         return err;
5283 }
5284
5285 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5286 {
5287         int res = 0;
5288         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5289                 case FL_POSIX:
5290                         res = posix_lock_file_wait(file, fl);
5291                         break;
5292                 case FL_FLOCK:
5293                         res = flock_lock_file_wait(file, fl);
5294                         break;
5295                 default:
5296                         BUG();
5297         }
5298         return res;
5299 }
5300
5301 struct nfs4_unlockdata {
5302         struct nfs_locku_args arg;
5303         struct nfs_locku_res res;
5304         struct nfs4_lock_state *lsp;
5305         struct nfs_open_context *ctx;
5306         struct file_lock fl;
5307         const struct nfs_server *server;
5308         unsigned long timestamp;
5309 };
5310
5311 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5312                 struct nfs_open_context *ctx,
5313                 struct nfs4_lock_state *lsp,
5314                 struct nfs_seqid *seqid)
5315 {
5316         struct nfs4_unlockdata *p;
5317         struct inode *inode = lsp->ls_state->inode;
5318
5319         p = kzalloc(sizeof(*p), GFP_NOFS);
5320         if (p == NULL)
5321                 return NULL;
5322         p->arg.fh = NFS_FH(inode);
5323         p->arg.fl = &p->fl;
5324         p->arg.seqid = seqid;
5325         p->res.seqid = seqid;
5326         p->arg.stateid = &lsp->ls_stateid;
5327         p->lsp = lsp;
5328         atomic_inc(&lsp->ls_count);
5329         /* Ensure we don't close file until we're done freeing locks! */
5330         p->ctx = get_nfs_open_context(ctx);
5331         memcpy(&p->fl, fl, sizeof(p->fl));
5332         p->server = NFS_SERVER(inode);
5333         return p;
5334 }
5335
5336 static void nfs4_locku_release_calldata(void *data)
5337 {
5338         struct nfs4_unlockdata *calldata = data;
5339         nfs_free_seqid(calldata->arg.seqid);
5340         nfs4_put_lock_state(calldata->lsp);
5341         put_nfs_open_context(calldata->ctx);
5342         kfree(calldata);
5343 }
5344
5345 static void nfs4_locku_done(struct rpc_task *task, void *data)
5346 {
5347         struct nfs4_unlockdata *calldata = data;
5348
5349         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5350                 return;
5351         switch (task->tk_status) {
5352                 case 0:
5353                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5354                                         &calldata->res.stateid);
5355                         renew_lease(calldata->server, calldata->timestamp);
5356                         break;
5357                 case -NFS4ERR_BAD_STATEID:
5358                 case -NFS4ERR_OLD_STATEID:
5359                 case -NFS4ERR_STALE_STATEID:
5360                 case -NFS4ERR_EXPIRED:
5361                         break;
5362                 default:
5363                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5364                                 rpc_restart_call_prepare(task);
5365         }
5366         nfs_release_seqid(calldata->arg.seqid);
5367 }
5368
5369 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5370 {
5371         struct nfs4_unlockdata *calldata = data;
5372
5373         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5374                 goto out_wait;
5375         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5376                 /* Note: exit _without_ running nfs4_locku_done */
5377                 goto out_no_action;
5378         }
5379         calldata->timestamp = jiffies;
5380         if (nfs4_setup_sequence(calldata->server,
5381                                 &calldata->arg.seq_args,
5382                                 &calldata->res.seq_res,
5383                                 task) != 0)
5384                 nfs_release_seqid(calldata->arg.seqid);
5385         return;
5386 out_no_action:
5387         task->tk_action = NULL;
5388 out_wait:
5389         nfs4_sequence_done(task, &calldata->res.seq_res);
5390 }
5391
5392 static const struct rpc_call_ops nfs4_locku_ops = {
5393         .rpc_call_prepare = nfs4_locku_prepare,
5394         .rpc_call_done = nfs4_locku_done,
5395         .rpc_release = nfs4_locku_release_calldata,
5396 };
5397
5398 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5399                 struct nfs_open_context *ctx,
5400                 struct nfs4_lock_state *lsp,
5401                 struct nfs_seqid *seqid)
5402 {
5403         struct nfs4_unlockdata *data;
5404         struct rpc_message msg = {
5405                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5406                 .rpc_cred = ctx->cred,
5407         };
5408         struct rpc_task_setup task_setup_data = {
5409                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5410                 .rpc_message = &msg,
5411                 .callback_ops = &nfs4_locku_ops,
5412                 .workqueue = nfsiod_workqueue,
5413                 .flags = RPC_TASK_ASYNC,
5414         };
5415
5416         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5417                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5418
5419         /* Ensure this is an unlock - when canceling a lock, the
5420          * canceled lock is passed in, and it won't be an unlock.
5421          */
5422         fl->fl_type = F_UNLCK;
5423
5424         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5425         if (data == NULL) {
5426                 nfs_free_seqid(seqid);
5427                 return ERR_PTR(-ENOMEM);
5428         }
5429
5430         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5431         msg.rpc_argp = &data->arg;
5432         msg.rpc_resp = &data->res;
5433         task_setup_data.callback_data = data;
5434         return rpc_run_task(&task_setup_data);
5435 }
5436
5437 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5438 {
5439         struct inode *inode = state->inode;
5440         struct nfs4_state_owner *sp = state->owner;
5441         struct nfs_inode *nfsi = NFS_I(inode);
5442         struct nfs_seqid *seqid;
5443         struct nfs4_lock_state *lsp;
5444         struct rpc_task *task;
5445         int status = 0;
5446         unsigned char fl_flags = request->fl_flags;
5447
5448         status = nfs4_set_lock_state(state, request);
5449         /* Unlock _before_ we do the RPC call */
5450         request->fl_flags |= FL_EXISTS;
5451         /* Exclude nfs_delegation_claim_locks() */
5452         mutex_lock(&sp->so_delegreturn_mutex);
5453         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5454         down_read(&nfsi->rwsem);
5455         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5456                 up_read(&nfsi->rwsem);
5457                 mutex_unlock(&sp->so_delegreturn_mutex);
5458                 goto out;
5459         }
5460         up_read(&nfsi->rwsem);
5461         mutex_unlock(&sp->so_delegreturn_mutex);
5462         if (status != 0)
5463                 goto out;
5464         /* Is this a delegated lock? */
5465         lsp = request->fl_u.nfs4_fl.owner;
5466         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5467                 goto out;
5468         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5469         status = -ENOMEM;
5470         if (seqid == NULL)
5471                 goto out;
5472         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5473         status = PTR_ERR(task);
5474         if (IS_ERR(task))
5475                 goto out;
5476         status = nfs4_wait_for_completion_rpc_task(task);
5477         rpc_put_task(task);
5478 out:
5479         request->fl_flags = fl_flags;
5480         trace_nfs4_unlock(request, state, F_SETLK, status);
5481         return status;
5482 }
5483
5484 struct nfs4_lockdata {
5485         struct nfs_lock_args arg;
5486         struct nfs_lock_res res;
5487         struct nfs4_lock_state *lsp;
5488         struct nfs_open_context *ctx;
5489         struct file_lock fl;
5490         unsigned long timestamp;
5491         int rpc_status;
5492         int cancelled;
5493         struct nfs_server *server;
5494 };
5495
5496 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5497                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5498                 gfp_t gfp_mask)
5499 {
5500         struct nfs4_lockdata *p;
5501         struct inode *inode = lsp->ls_state->inode;
5502         struct nfs_server *server = NFS_SERVER(inode);
5503
5504         p = kzalloc(sizeof(*p), gfp_mask);
5505         if (p == NULL)
5506                 return NULL;
5507
5508         p->arg.fh = NFS_FH(inode);
5509         p->arg.fl = &p->fl;
5510         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5511         if (p->arg.open_seqid == NULL)
5512                 goto out_free;
5513         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5514         if (p->arg.lock_seqid == NULL)
5515                 goto out_free_seqid;
5516         p->arg.lock_stateid = &lsp->ls_stateid;
5517         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5518         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5519         p->arg.lock_owner.s_dev = server->s_dev;
5520         p->res.lock_seqid = p->arg.lock_seqid;
5521         p->lsp = lsp;
5522         p->server = server;
5523         atomic_inc(&lsp->ls_count);
5524         p->ctx = get_nfs_open_context(ctx);
5525         memcpy(&p->fl, fl, sizeof(p->fl));
5526         return p;
5527 out_free_seqid:
5528         nfs_free_seqid(p->arg.open_seqid);
5529 out_free:
5530         kfree(p);
5531         return NULL;
5532 }
5533
5534 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5535 {
5536         struct nfs4_lockdata *data = calldata;
5537         struct nfs4_state *state = data->lsp->ls_state;
5538
5539         dprintk("%s: begin!\n", __func__);
5540         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5541                 goto out_wait;
5542         /* Do we need to do an open_to_lock_owner? */
5543         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5544                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5545                         goto out_release_lock_seqid;
5546                 }
5547                 data->arg.open_stateid = &state->open_stateid;
5548                 data->arg.new_lock_owner = 1;
5549                 data->res.open_seqid = data->arg.open_seqid;
5550         } else
5551                 data->arg.new_lock_owner = 0;
5552         if (!nfs4_valid_open_stateid(state)) {
5553                 data->rpc_status = -EBADF;
5554                 task->tk_action = NULL;
5555                 goto out_release_open_seqid;
5556         }
5557         data->timestamp = jiffies;
5558         if (nfs4_setup_sequence(data->server,
5559                                 &data->arg.seq_args,
5560                                 &data->res.seq_res,
5561                                 task) == 0)
5562                 return;
5563 out_release_open_seqid:
5564         nfs_release_seqid(data->arg.open_seqid);
5565 out_release_lock_seqid:
5566         nfs_release_seqid(data->arg.lock_seqid);
5567 out_wait:
5568         nfs4_sequence_done(task, &data->res.seq_res);
5569         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5570 }
5571
5572 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5573 {
5574         struct nfs4_lockdata *data = calldata;
5575
5576         dprintk("%s: begin!\n", __func__);
5577
5578         if (!nfs4_sequence_done(task, &data->res.seq_res))
5579                 return;
5580
5581         data->rpc_status = task->tk_status;
5582         if (data->arg.new_lock_owner != 0) {
5583                 if (data->rpc_status == 0)
5584                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5585                 else
5586                         goto out;
5587         }
5588         if (data->rpc_status == 0) {
5589                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5590                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5591                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5592         }
5593 out:
5594         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5595 }
5596
5597 static void nfs4_lock_release(void *calldata)
5598 {
5599         struct nfs4_lockdata *data = calldata;
5600
5601         dprintk("%s: begin!\n", __func__);
5602         nfs_free_seqid(data->arg.open_seqid);
5603         if (data->cancelled != 0) {
5604                 struct rpc_task *task;
5605                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5606                                 data->arg.lock_seqid);
5607                 if (!IS_ERR(task))
5608                         rpc_put_task_async(task);
5609                 dprintk("%s: cancelling lock!\n", __func__);
5610         } else
5611                 nfs_free_seqid(data->arg.lock_seqid);
5612         nfs4_put_lock_state(data->lsp);
5613         put_nfs_open_context(data->ctx);
5614         kfree(data);
5615         dprintk("%s: done!\n", __func__);
5616 }
5617
5618 static const struct rpc_call_ops nfs4_lock_ops = {
5619         .rpc_call_prepare = nfs4_lock_prepare,
5620         .rpc_call_done = nfs4_lock_done,
5621         .rpc_release = nfs4_lock_release,
5622 };
5623
5624 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5625 {
5626         switch (error) {
5627         case -NFS4ERR_ADMIN_REVOKED:
5628         case -NFS4ERR_BAD_STATEID:
5629                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5630                 if (new_lock_owner != 0 ||
5631                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5632                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5633                 break;
5634         case -NFS4ERR_STALE_STATEID:
5635                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5636         case -NFS4ERR_EXPIRED:
5637                 nfs4_schedule_lease_recovery(server->nfs_client);
5638         };
5639 }
5640
5641 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5642 {
5643         struct nfs4_lockdata *data;
5644         struct rpc_task *task;
5645         struct rpc_message msg = {
5646                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5647                 .rpc_cred = state->owner->so_cred,
5648         };
5649         struct rpc_task_setup task_setup_data = {
5650                 .rpc_client = NFS_CLIENT(state->inode),
5651                 .rpc_message = &msg,
5652                 .callback_ops = &nfs4_lock_ops,
5653                 .workqueue = nfsiod_workqueue,
5654                 .flags = RPC_TASK_ASYNC,
5655         };
5656         int ret;
5657
5658         dprintk("%s: begin!\n", __func__);
5659         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5660                         fl->fl_u.nfs4_fl.owner,
5661                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5662         if (data == NULL)
5663                 return -ENOMEM;
5664         if (IS_SETLKW(cmd))
5665                 data->arg.block = 1;
5666         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5667         msg.rpc_argp = &data->arg;
5668         msg.rpc_resp = &data->res;
5669         task_setup_data.callback_data = data;
5670         if (recovery_type > NFS_LOCK_NEW) {
5671                 if (recovery_type == NFS_LOCK_RECLAIM)
5672                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5673                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5674         }
5675         task = rpc_run_task(&task_setup_data);
5676         if (IS_ERR(task))
5677                 return PTR_ERR(task);
5678         ret = nfs4_wait_for_completion_rpc_task(task);
5679         if (ret == 0) {
5680                 ret = data->rpc_status;
5681                 if (ret)
5682                         nfs4_handle_setlk_error(data->server, data->lsp,
5683                                         data->arg.new_lock_owner, ret);
5684         } else
5685                 data->cancelled = 1;
5686         rpc_put_task(task);
5687         dprintk("%s: done, ret = %d!\n", __func__, ret);
5688         return ret;
5689 }
5690
5691 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5692 {
5693         struct nfs_server *server = NFS_SERVER(state->inode);
5694         struct nfs4_exception exception = {
5695                 .inode = state->inode,
5696         };
5697         int err;
5698
5699         do {
5700                 /* Cache the lock if possible... */
5701                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5702                         return 0;
5703                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5704                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5705                 if (err != -NFS4ERR_DELAY)
5706                         break;
5707                 nfs4_handle_exception(server, err, &exception);
5708         } while (exception.retry);
5709         return err;
5710 }
5711
5712 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5713 {
5714         struct nfs_server *server = NFS_SERVER(state->inode);
5715         struct nfs4_exception exception = {
5716                 .inode = state->inode,
5717         };
5718         int err;
5719
5720         err = nfs4_set_lock_state(state, request);
5721         if (err != 0)
5722                 return err;
5723         if (!recover_lost_locks) {
5724                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5725                 return 0;
5726         }
5727         do {
5728                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5729                         return 0;
5730                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5731                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5732                 switch (err) {
5733                 default:
5734                         goto out;
5735                 case -NFS4ERR_GRACE:
5736                 case -NFS4ERR_DELAY:
5737                         nfs4_handle_exception(server, err, &exception);
5738                         err = 0;
5739                 }
5740         } while (exception.retry);
5741 out:
5742         return err;
5743 }
5744
5745 #if defined(CONFIG_NFS_V4_1)
5746 /**
5747  * nfs41_check_expired_locks - possibly free a lock stateid
5748  *
5749  * @state: NFSv4 state for an inode
5750  *
5751  * Returns NFS_OK if recovery for this stateid is now finished.
5752  * Otherwise a negative NFS4ERR value is returned.
5753  */
5754 static int nfs41_check_expired_locks(struct nfs4_state *state)
5755 {
5756         int status, ret = -NFS4ERR_BAD_STATEID;
5757         struct nfs4_lock_state *lsp;
5758         struct nfs_server *server = NFS_SERVER(state->inode);
5759
5760         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5761                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5762                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5763
5764                         status = nfs41_test_stateid(server,
5765                                         &lsp->ls_stateid,
5766                                         cred);
5767                         trace_nfs4_test_lock_stateid(state, lsp, status);
5768                         if (status != NFS_OK) {
5769                                 /* Free the stateid unless the server
5770                                  * informs us the stateid is unrecognized. */
5771                                 if (status != -NFS4ERR_BAD_STATEID)
5772                                         nfs41_free_stateid(server,
5773                                                         &lsp->ls_stateid,
5774                                                         cred);
5775                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5776                                 ret = status;
5777                         }
5778                 }
5779         };
5780
5781         return ret;
5782 }
5783
5784 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5785 {
5786         int status = NFS_OK;
5787
5788         if (test_bit(LK_STATE_IN_USE, &state->flags))
5789                 status = nfs41_check_expired_locks(state);
5790         if (status != NFS_OK)
5791                 status = nfs4_lock_expired(state, request);
5792         return status;
5793 }
5794 #endif
5795
5796 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5797 {
5798         struct nfs4_state_owner *sp = state->owner;
5799         struct nfs_inode *nfsi = NFS_I(state->inode);
5800         unsigned char fl_flags = request->fl_flags;
5801         unsigned int seq;
5802         int status = -ENOLCK;
5803
5804         if ((fl_flags & FL_POSIX) &&
5805                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5806                 goto out;
5807         /* Is this a delegated open? */
5808         status = nfs4_set_lock_state(state, request);
5809         if (status != 0)
5810                 goto out;
5811         request->fl_flags |= FL_ACCESS;
5812         status = do_vfs_lock(request->fl_file, request);
5813         if (status < 0)
5814                 goto out;
5815         down_read(&nfsi->rwsem);
5816         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5817                 /* Yes: cache locks! */
5818                 /* ...but avoid races with delegation recall... */
5819                 request->fl_flags = fl_flags & ~FL_SLEEP;
5820                 status = do_vfs_lock(request->fl_file, request);
5821                 goto out_unlock;
5822         }
5823         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5824         up_read(&nfsi->rwsem);
5825         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5826         if (status != 0)
5827                 goto out;
5828         down_read(&nfsi->rwsem);
5829         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5830                 status = -NFS4ERR_DELAY;
5831                 goto out_unlock;
5832         }
5833         /* Note: we always want to sleep here! */
5834         request->fl_flags = fl_flags | FL_SLEEP;
5835         if (do_vfs_lock(request->fl_file, request) < 0)
5836                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5837                         "manager!\n", __func__);
5838 out_unlock:
5839         up_read(&nfsi->rwsem);
5840 out:
5841         request->fl_flags = fl_flags;
5842         return status;
5843 }
5844
5845 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5846 {
5847         struct nfs4_exception exception = {
5848                 .state = state,
5849                 .inode = state->inode,
5850         };
5851         int err;
5852
5853         do {
5854                 err = _nfs4_proc_setlk(state, cmd, request);
5855                 trace_nfs4_set_lock(request, state, cmd, err);
5856                 if (err == -NFS4ERR_DENIED)
5857                         err = -EAGAIN;
5858                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5859                                 err, &exception);
5860         } while (exception.retry);
5861         return err;
5862 }
5863
5864 static int
5865 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5866 {
5867         struct nfs_open_context *ctx;
5868         struct nfs4_state *state;
5869         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5870         int status;
5871
5872         /* verify open state */
5873         ctx = nfs_file_open_context(filp);
5874         state = ctx->state;
5875
5876         if (request->fl_start < 0 || request->fl_end < 0)
5877                 return -EINVAL;
5878
5879         if (IS_GETLK(cmd)) {
5880                 if (state != NULL)
5881                         return nfs4_proc_getlk(state, F_GETLK, request);
5882                 return 0;
5883         }
5884
5885         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5886                 return -EINVAL;
5887
5888         if (request->fl_type == F_UNLCK) {
5889                 if (state != NULL)
5890                         return nfs4_proc_unlck(state, cmd, request);
5891                 return 0;
5892         }
5893
5894         if (state == NULL)
5895                 return -ENOLCK;
5896         /*
5897          * Don't rely on the VFS having checked the file open mode,
5898          * since it won't do this for flock() locks.
5899          */
5900         switch (request->fl_type) {
5901         case F_RDLCK:
5902                 if (!(filp->f_mode & FMODE_READ))
5903                         return -EBADF;
5904                 break;
5905         case F_WRLCK:
5906                 if (!(filp->f_mode & FMODE_WRITE))
5907                         return -EBADF;
5908         }
5909
5910         do {
5911                 status = nfs4_proc_setlk(state, cmd, request);
5912                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5913                         break;
5914                 timeout = nfs4_set_lock_task_retry(timeout);
5915                 status = -ERESTARTSYS;
5916                 if (signalled())
5917                         break;
5918         } while(status < 0);
5919         return status;
5920 }
5921
5922 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5923 {
5924         struct nfs_server *server = NFS_SERVER(state->inode);
5925         int err;
5926
5927         err = nfs4_set_lock_state(state, fl);
5928         if (err != 0)
5929                 return err;
5930         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5931         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5932 }
5933
5934 struct nfs_release_lockowner_data {
5935         struct nfs4_lock_state *lsp;
5936         struct nfs_server *server;
5937         struct nfs_release_lockowner_args args;
5938         struct nfs_release_lockowner_res res;
5939         unsigned long timestamp;
5940 };
5941
5942 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5943 {
5944         struct nfs_release_lockowner_data *data = calldata;
5945         nfs40_setup_sequence(data->server,
5946                                 &data->args.seq_args, &data->res.seq_res, task);
5947         data->timestamp = jiffies;
5948 }
5949
5950 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5951 {
5952         struct nfs_release_lockowner_data *data = calldata;
5953         struct nfs_server *server = data->server;
5954
5955         nfs40_sequence_done(task, &data->res.seq_res);
5956
5957         switch (task->tk_status) {
5958         case 0:
5959                 renew_lease(server, data->timestamp);
5960                 break;
5961         case -NFS4ERR_STALE_CLIENTID:
5962         case -NFS4ERR_EXPIRED:
5963         case -NFS4ERR_LEASE_MOVED:
5964         case -NFS4ERR_DELAY:
5965                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5966                         rpc_restart_call_prepare(task);
5967         }
5968 }
5969
5970 static void nfs4_release_lockowner_release(void *calldata)
5971 {
5972         struct nfs_release_lockowner_data *data = calldata;
5973         nfs4_free_lock_state(data->server, data->lsp);
5974         kfree(calldata);
5975 }
5976
5977 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5978         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5979         .rpc_call_done = nfs4_release_lockowner_done,
5980         .rpc_release = nfs4_release_lockowner_release,
5981 };
5982
5983 static void
5984 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5985 {
5986         struct nfs_release_lockowner_data *data;
5987         struct rpc_message msg = {
5988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5989         };
5990
5991         if (server->nfs_client->cl_mvops->minor_version != 0)
5992                 return;
5993
5994         data = kmalloc(sizeof(*data), GFP_NOFS);
5995         if (!data)
5996                 return;
5997         data->lsp = lsp;
5998         data->server = server;
5999         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6000         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6001         data->args.lock_owner.s_dev = server->s_dev;
6002
6003         msg.rpc_argp = &data->args;
6004         msg.rpc_resp = &data->res;
6005         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6006         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6007 }
6008
6009 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6010
6011 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6012                                    const void *buf, size_t buflen,
6013                                    int flags, int type)
6014 {
6015         if (strcmp(key, "") != 0)
6016                 return -EINVAL;
6017
6018         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6019 }
6020
6021 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6022                                    void *buf, size_t buflen, int type)
6023 {
6024         if (strcmp(key, "") != 0)
6025                 return -EINVAL;
6026
6027         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6028 }
6029
6030 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6031                                        size_t list_len, const char *name,
6032                                        size_t name_len, int type)
6033 {
6034         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6035
6036         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6037                 return 0;
6038
6039         if (list && len <= list_len)
6040                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6041         return len;
6042 }
6043
6044 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6045 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6046 {
6047         return server->caps & NFS_CAP_SECURITY_LABEL;
6048 }
6049
6050 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6051                                    const void *buf, size_t buflen,
6052                                    int flags, int type)
6053 {
6054         if (security_ismaclabel(key))
6055                 return nfs4_set_security_label(dentry, buf, buflen);
6056
6057         return -EOPNOTSUPP;
6058 }
6059
6060 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6061                                    void *buf, size_t buflen, int type)
6062 {
6063         if (security_ismaclabel(key))
6064                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6065         return -EOPNOTSUPP;
6066 }
6067
6068 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6069                                        size_t list_len, const char *name,
6070                                        size_t name_len, int type)
6071 {
6072         size_t len = 0;
6073
6074         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6075                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6076                 if (list && len <= list_len)
6077                         security_inode_listsecurity(dentry->d_inode, list, len);
6078         }
6079         return len;
6080 }
6081
6082 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6083         .prefix = XATTR_SECURITY_PREFIX,
6084         .list   = nfs4_xattr_list_nfs4_label,
6085         .get    = nfs4_xattr_get_nfs4_label,
6086         .set    = nfs4_xattr_set_nfs4_label,
6087 };
6088 #endif
6089
6090
6091 /*
6092  * nfs_fhget will use either the mounted_on_fileid or the fileid
6093  */
6094 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6095 {
6096         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6097                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6098               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6099               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6100                 return;
6101
6102         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6103                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6104         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6105         fattr->nlink = 2;
6106 }
6107
6108 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6109                                    const struct qstr *name,
6110                                    struct nfs4_fs_locations *fs_locations,
6111                                    struct page *page)
6112 {
6113         struct nfs_server *server = NFS_SERVER(dir);
6114         u32 bitmask[3] = {
6115                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6116         };
6117         struct nfs4_fs_locations_arg args = {
6118                 .dir_fh = NFS_FH(dir),
6119                 .name = name,
6120                 .page = page,
6121                 .bitmask = bitmask,
6122         };
6123         struct nfs4_fs_locations_res res = {
6124                 .fs_locations = fs_locations,
6125         };
6126         struct rpc_message msg = {
6127                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6128                 .rpc_argp = &args,
6129                 .rpc_resp = &res,
6130         };
6131         int status;
6132
6133         dprintk("%s: start\n", __func__);
6134
6135         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6136          * is not supported */
6137         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6138                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6139         else
6140                 bitmask[0] |= FATTR4_WORD0_FILEID;
6141
6142         nfs_fattr_init(&fs_locations->fattr);
6143         fs_locations->server = server;
6144         fs_locations->nlocations = 0;
6145         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6146         dprintk("%s: returned status = %d\n", __func__, status);
6147         return status;
6148 }
6149
6150 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6151                            const struct qstr *name,
6152                            struct nfs4_fs_locations *fs_locations,
6153                            struct page *page)
6154 {
6155         struct nfs4_exception exception = { };
6156         int err;
6157         do {
6158                 err = _nfs4_proc_fs_locations(client, dir, name,
6159                                 fs_locations, page);
6160                 trace_nfs4_get_fs_locations(dir, name, err);
6161                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6162                                 &exception);
6163         } while (exception.retry);
6164         return err;
6165 }
6166
6167 /*
6168  * This operation also signals the server that this client is
6169  * performing migration recovery.  The server can stop returning
6170  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6171  * appended to this compound to identify the client ID which is
6172  * performing recovery.
6173  */
6174 static int _nfs40_proc_get_locations(struct inode *inode,
6175                                      struct nfs4_fs_locations *locations,
6176                                      struct page *page, struct rpc_cred *cred)
6177 {
6178         struct nfs_server *server = NFS_SERVER(inode);
6179         struct rpc_clnt *clnt = server->client;
6180         u32 bitmask[2] = {
6181                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6182         };
6183         struct nfs4_fs_locations_arg args = {
6184                 .clientid       = server->nfs_client->cl_clientid,
6185                 .fh             = NFS_FH(inode),
6186                 .page           = page,
6187                 .bitmask        = bitmask,
6188                 .migration      = 1,            /* skip LOOKUP */
6189                 .renew          = 1,            /* append RENEW */
6190         };
6191         struct nfs4_fs_locations_res res = {
6192                 .fs_locations   = locations,
6193                 .migration      = 1,
6194                 .renew          = 1,
6195         };
6196         struct rpc_message msg = {
6197                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6198                 .rpc_argp       = &args,
6199                 .rpc_resp       = &res,
6200                 .rpc_cred       = cred,
6201         };
6202         unsigned long now = jiffies;
6203         int status;
6204
6205         nfs_fattr_init(&locations->fattr);
6206         locations->server = server;
6207         locations->nlocations = 0;
6208
6209         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6210         nfs4_set_sequence_privileged(&args.seq_args);
6211         status = nfs4_call_sync_sequence(clnt, server, &msg,
6212                                         &args.seq_args, &res.seq_res);
6213         if (status)
6214                 return status;
6215
6216         renew_lease(server, now);
6217         return 0;
6218 }
6219
6220 #ifdef CONFIG_NFS_V4_1
6221
6222 /*
6223  * This operation also signals the server that this client is
6224  * performing migration recovery.  The server can stop asserting
6225  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6226  * performing this operation is identified in the SEQUENCE
6227  * operation in this compound.
6228  *
6229  * When the client supports GETATTR(fs_locations_info), it can
6230  * be plumbed in here.
6231  */
6232 static int _nfs41_proc_get_locations(struct inode *inode,
6233                                      struct nfs4_fs_locations *locations,
6234                                      struct page *page, struct rpc_cred *cred)
6235 {
6236         struct nfs_server *server = NFS_SERVER(inode);
6237         struct rpc_clnt *clnt = server->client;
6238         u32 bitmask[2] = {
6239                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6240         };
6241         struct nfs4_fs_locations_arg args = {
6242                 .fh             = NFS_FH(inode),
6243                 .page           = page,
6244                 .bitmask        = bitmask,
6245                 .migration      = 1,            /* skip LOOKUP */
6246         };
6247         struct nfs4_fs_locations_res res = {
6248                 .fs_locations   = locations,
6249                 .migration      = 1,
6250         };
6251         struct rpc_message msg = {
6252                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6253                 .rpc_argp       = &args,
6254                 .rpc_resp       = &res,
6255                 .rpc_cred       = cred,
6256         };
6257         int status;
6258
6259         nfs_fattr_init(&locations->fattr);
6260         locations->server = server;
6261         locations->nlocations = 0;
6262
6263         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6264         nfs4_set_sequence_privileged(&args.seq_args);
6265         status = nfs4_call_sync_sequence(clnt, server, &msg,
6266                                         &args.seq_args, &res.seq_res);
6267         if (status == NFS4_OK &&
6268             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6269                 status = -NFS4ERR_LEASE_MOVED;
6270         return status;
6271 }
6272
6273 #endif  /* CONFIG_NFS_V4_1 */
6274
6275 /**
6276  * nfs4_proc_get_locations - discover locations for a migrated FSID
6277  * @inode: inode on FSID that is migrating
6278  * @locations: result of query
6279  * @page: buffer
6280  * @cred: credential to use for this operation
6281  *
6282  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6283  * operation failed, or a negative errno if a local error occurred.
6284  *
6285  * On success, "locations" is filled in, but if the server has
6286  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6287  * asserted.
6288  *
6289  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6290  * from this client that require migration recovery.
6291  */
6292 int nfs4_proc_get_locations(struct inode *inode,
6293                             struct nfs4_fs_locations *locations,
6294                             struct page *page, struct rpc_cred *cred)
6295 {
6296         struct nfs_server *server = NFS_SERVER(inode);
6297         struct nfs_client *clp = server->nfs_client;
6298         const struct nfs4_mig_recovery_ops *ops =
6299                                         clp->cl_mvops->mig_recovery_ops;
6300         struct nfs4_exception exception = { };
6301         int status;
6302
6303         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6304                 (unsigned long long)server->fsid.major,
6305                 (unsigned long long)server->fsid.minor,
6306                 clp->cl_hostname);
6307         nfs_display_fhandle(NFS_FH(inode), __func__);
6308
6309         do {
6310                 status = ops->get_locations(inode, locations, page, cred);
6311                 if (status != -NFS4ERR_DELAY)
6312                         break;
6313                 nfs4_handle_exception(server, status, &exception);
6314         } while (exception.retry);
6315         return status;
6316 }
6317
6318 /*
6319  * This operation also signals the server that this client is
6320  * performing "lease moved" recovery.  The server can stop
6321  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6322  * is appended to this compound to identify the client ID which is
6323  * performing recovery.
6324  */
6325 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6326 {
6327         struct nfs_server *server = NFS_SERVER(inode);
6328         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6329         struct rpc_clnt *clnt = server->client;
6330         struct nfs4_fsid_present_arg args = {
6331                 .fh             = NFS_FH(inode),
6332                 .clientid       = clp->cl_clientid,
6333                 .renew          = 1,            /* append RENEW */
6334         };
6335         struct nfs4_fsid_present_res res = {
6336                 .renew          = 1,
6337         };
6338         struct rpc_message msg = {
6339                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6340                 .rpc_argp       = &args,
6341                 .rpc_resp       = &res,
6342                 .rpc_cred       = cred,
6343         };
6344         unsigned long now = jiffies;
6345         int status;
6346
6347         res.fh = nfs_alloc_fhandle();
6348         if (res.fh == NULL)
6349                 return -ENOMEM;
6350
6351         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6352         nfs4_set_sequence_privileged(&args.seq_args);
6353         status = nfs4_call_sync_sequence(clnt, server, &msg,
6354                                                 &args.seq_args, &res.seq_res);
6355         nfs_free_fhandle(res.fh);
6356         if (status)
6357                 return status;
6358
6359         do_renew_lease(clp, now);
6360         return 0;
6361 }
6362
6363 #ifdef CONFIG_NFS_V4_1
6364
6365 /*
6366  * This operation also signals the server that this client is
6367  * performing "lease moved" recovery.  The server can stop asserting
6368  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6369  * this operation is identified in the SEQUENCE operation in this
6370  * compound.
6371  */
6372 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6373 {
6374         struct nfs_server *server = NFS_SERVER(inode);
6375         struct rpc_clnt *clnt = server->client;
6376         struct nfs4_fsid_present_arg args = {
6377                 .fh             = NFS_FH(inode),
6378         };
6379         struct nfs4_fsid_present_res res = {
6380         };
6381         struct rpc_message msg = {
6382                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6383                 .rpc_argp       = &args,
6384                 .rpc_resp       = &res,
6385                 .rpc_cred       = cred,
6386         };
6387         int status;
6388
6389         res.fh = nfs_alloc_fhandle();
6390         if (res.fh == NULL)
6391                 return -ENOMEM;
6392
6393         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6394         nfs4_set_sequence_privileged(&args.seq_args);
6395         status = nfs4_call_sync_sequence(clnt, server, &msg,
6396                                                 &args.seq_args, &res.seq_res);
6397         nfs_free_fhandle(res.fh);
6398         if (status == NFS4_OK &&
6399             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6400                 status = -NFS4ERR_LEASE_MOVED;
6401         return status;
6402 }
6403
6404 #endif  /* CONFIG_NFS_V4_1 */
6405
6406 /**
6407  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6408  * @inode: inode on FSID to check
6409  * @cred: credential to use for this operation
6410  *
6411  * Server indicates whether the FSID is present, moved, or not
6412  * recognized.  This operation is necessary to clear a LEASE_MOVED
6413  * condition for this client ID.
6414  *
6415  * Returns NFS4_OK if the FSID is present on this server,
6416  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6417  *  NFS4ERR code if some error occurred on the server, or a
6418  *  negative errno if a local failure occurred.
6419  */
6420 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6421 {
6422         struct nfs_server *server = NFS_SERVER(inode);
6423         struct nfs_client *clp = server->nfs_client;
6424         const struct nfs4_mig_recovery_ops *ops =
6425                                         clp->cl_mvops->mig_recovery_ops;
6426         struct nfs4_exception exception = { };
6427         int status;
6428
6429         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6430                 (unsigned long long)server->fsid.major,
6431                 (unsigned long long)server->fsid.minor,
6432                 clp->cl_hostname);
6433         nfs_display_fhandle(NFS_FH(inode), __func__);
6434
6435         do {
6436                 status = ops->fsid_present(inode, cred);
6437                 if (status != -NFS4ERR_DELAY)
6438                         break;
6439                 nfs4_handle_exception(server, status, &exception);
6440         } while (exception.retry);
6441         return status;
6442 }
6443
6444 /**
6445  * If 'use_integrity' is true and the state managment nfs_client
6446  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6447  * and the machine credential as per RFC3530bis and RFC5661 Security
6448  * Considerations sections. Otherwise, just use the user cred with the
6449  * filesystem's rpc_client.
6450  */
6451 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6452 {
6453         int status;
6454         struct nfs4_secinfo_arg args = {
6455                 .dir_fh = NFS_FH(dir),
6456                 .name   = name,
6457         };
6458         struct nfs4_secinfo_res res = {
6459                 .flavors     = flavors,
6460         };
6461         struct rpc_message msg = {
6462                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6463                 .rpc_argp = &args,
6464                 .rpc_resp = &res,
6465         };
6466         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6467         struct rpc_cred *cred = NULL;
6468
6469         if (use_integrity) {
6470                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6471                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6472                 msg.rpc_cred = cred;
6473         }
6474
6475         dprintk("NFS call  secinfo %s\n", name->name);
6476
6477         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6478                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6479
6480         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6481                                 &res.seq_res, 0);
6482         dprintk("NFS reply  secinfo: %d\n", status);
6483
6484         if (cred)
6485                 put_rpccred(cred);
6486
6487         return status;
6488 }
6489
6490 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6491                       struct nfs4_secinfo_flavors *flavors)
6492 {
6493         struct nfs4_exception exception = { };
6494         int err;
6495         do {
6496                 err = -NFS4ERR_WRONGSEC;
6497
6498                 /* try to use integrity protection with machine cred */
6499                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6500                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6501
6502                 /*
6503                  * if unable to use integrity protection, or SECINFO with
6504                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6505                  * disallowed by spec, but exists in deployed servers) use
6506                  * the current filesystem's rpc_client and the user cred.
6507                  */
6508                 if (err == -NFS4ERR_WRONGSEC)
6509                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6510
6511                 trace_nfs4_secinfo(dir, name, err);
6512                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6513                                 &exception);
6514         } while (exception.retry);
6515         return err;
6516 }
6517
6518 #ifdef CONFIG_NFS_V4_1
6519 /*
6520  * Check the exchange flags returned by the server for invalid flags, having
6521  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6522  * DS flags set.
6523  */
6524 static int nfs4_check_cl_exchange_flags(u32 flags)
6525 {
6526         if (flags & ~EXCHGID4_FLAG_MASK_R)
6527                 goto out_inval;
6528         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6529             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6530                 goto out_inval;
6531         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6532                 goto out_inval;
6533         return NFS_OK;
6534 out_inval:
6535         return -NFS4ERR_INVAL;
6536 }
6537
6538 static bool
6539 nfs41_same_server_scope(struct nfs41_server_scope *a,
6540                         struct nfs41_server_scope *b)
6541 {
6542         if (a->server_scope_sz == b->server_scope_sz &&
6543             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6544                 return true;
6545
6546         return false;
6547 }
6548
6549 /*
6550  * nfs4_proc_bind_conn_to_session()
6551  *
6552  * The 4.1 client currently uses the same TCP connection for the
6553  * fore and backchannel.
6554  */
6555 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6556 {
6557         int status;
6558         struct nfs41_bind_conn_to_session_res res;
6559         struct rpc_message msg = {
6560                 .rpc_proc =
6561                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6562                 .rpc_argp = clp,
6563                 .rpc_resp = &res,
6564                 .rpc_cred = cred,
6565         };
6566
6567         dprintk("--> %s\n", __func__);
6568
6569         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6570         if (unlikely(res.session == NULL)) {
6571                 status = -ENOMEM;
6572                 goto out;
6573         }
6574
6575         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6576         trace_nfs4_bind_conn_to_session(clp, status);
6577         if (status == 0) {
6578                 if (memcmp(res.session->sess_id.data,
6579                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6580                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6581                         status = -EIO;
6582                         goto out_session;
6583                 }
6584                 if (res.dir != NFS4_CDFS4_BOTH) {
6585                         dprintk("NFS: %s: Unexpected direction from server\n",
6586                                 __func__);
6587                         status = -EIO;
6588                         goto out_session;
6589                 }
6590                 if (res.use_conn_in_rdma_mode) {
6591                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6592                                 __func__);
6593                         status = -EIO;
6594                         goto out_session;
6595                 }
6596         }
6597 out_session:
6598         kfree(res.session);
6599 out:
6600         dprintk("<-- %s status= %d\n", __func__, status);
6601         return status;
6602 }
6603
6604 /*
6605  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6606  * and operations we'd like to see to enable certain features in the allow map
6607  */
6608 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6609         .how = SP4_MACH_CRED,
6610         .enforce.u.words = {
6611                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6612                       1 << (OP_EXCHANGE_ID - 32) |
6613                       1 << (OP_CREATE_SESSION - 32) |
6614                       1 << (OP_DESTROY_SESSION - 32) |
6615                       1 << (OP_DESTROY_CLIENTID - 32)
6616         },
6617         .allow.u.words = {
6618                 [0] = 1 << (OP_CLOSE) |
6619                       1 << (OP_LOCKU) |
6620                       1 << (OP_COMMIT),
6621                 [1] = 1 << (OP_SECINFO - 32) |
6622                       1 << (OP_SECINFO_NO_NAME - 32) |
6623                       1 << (OP_TEST_STATEID - 32) |
6624                       1 << (OP_FREE_STATEID - 32) |
6625                       1 << (OP_WRITE - 32)
6626         }
6627 };
6628
6629 /*
6630  * Select the state protection mode for client `clp' given the server results
6631  * from exchange_id in `sp'.
6632  *
6633  * Returns 0 on success, negative errno otherwise.
6634  */
6635 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6636                                  struct nfs41_state_protection *sp)
6637 {
6638         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6639                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6640                       1 << (OP_EXCHANGE_ID - 32) |
6641                       1 << (OP_CREATE_SESSION - 32) |
6642                       1 << (OP_DESTROY_SESSION - 32) |
6643                       1 << (OP_DESTROY_CLIENTID - 32)
6644         };
6645         unsigned int i;
6646
6647         if (sp->how == SP4_MACH_CRED) {
6648                 /* Print state protect result */
6649                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6650                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6651                         if (test_bit(i, sp->enforce.u.longs))
6652                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6653                         if (test_bit(i, sp->allow.u.longs))
6654                                 dfprintk(MOUNT, "  allow op %d\n", i);
6655                 }
6656
6657                 /* make sure nothing is on enforce list that isn't supported */
6658                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6659                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6660                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6661                                 return -EINVAL;
6662                         }
6663                 }
6664
6665                 /*
6666                  * Minimal mode - state operations are allowed to use machine
6667                  * credential.  Note this already happens by default, so the
6668                  * client doesn't have to do anything more than the negotiation.
6669                  *
6670                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6671                  *       we're already using the machine cred for exchange_id
6672                  *       and will never use a different cred.
6673                  */
6674                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6675                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6676                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6677                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6678                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6679                         dfprintk(MOUNT, "  minimal mode enabled\n");
6680                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6681                 } else {
6682                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6683                         return -EINVAL;
6684                 }
6685
6686                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6687                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6688                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6689                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6690                 }
6691
6692                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6693                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6694                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6695                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6696                 }
6697
6698                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6699                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6700                         dfprintk(MOUNT, "  stateid mode enabled\n");
6701                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6702                 }
6703
6704                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6705                         dfprintk(MOUNT, "  write mode enabled\n");
6706                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6707                 }
6708
6709                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6710                         dfprintk(MOUNT, "  commit mode enabled\n");
6711                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6712                 }
6713         }
6714
6715         return 0;
6716 }
6717
6718 /*
6719  * _nfs4_proc_exchange_id()
6720  *
6721  * Wrapper for EXCHANGE_ID operation.
6722  */
6723 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6724         u32 sp4_how)
6725 {
6726         nfs4_verifier verifier;
6727         struct nfs41_exchange_id_args args = {
6728                 .verifier = &verifier,
6729                 .client = clp,
6730 #ifdef CONFIG_NFS_V4_1_MIGRATION
6731                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6732                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6733                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6734 #else
6735                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6736                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6737 #endif
6738         };
6739         struct nfs41_exchange_id_res res = {
6740                 0
6741         };
6742         int status;
6743         struct rpc_message msg = {
6744                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6745                 .rpc_argp = &args,
6746                 .rpc_resp = &res,
6747                 .rpc_cred = cred,
6748         };
6749
6750         nfs4_init_boot_verifier(clp, &verifier);
6751         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6752                                                         sizeof(args.id));
6753         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6754                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6755                 args.id_len, args.id);
6756
6757         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6758                                         GFP_NOFS);
6759         if (unlikely(res.server_owner == NULL)) {
6760                 status = -ENOMEM;
6761                 goto out;
6762         }
6763
6764         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6765                                         GFP_NOFS);
6766         if (unlikely(res.server_scope == NULL)) {
6767                 status = -ENOMEM;
6768                 goto out_server_owner;
6769         }
6770
6771         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6772         if (unlikely(res.impl_id == NULL)) {
6773                 status = -ENOMEM;
6774                 goto out_server_scope;
6775         }
6776
6777         switch (sp4_how) {
6778         case SP4_NONE:
6779                 args.state_protect.how = SP4_NONE;
6780                 break;
6781
6782         case SP4_MACH_CRED:
6783                 args.state_protect = nfs4_sp4_mach_cred_request;
6784                 break;
6785
6786         default:
6787                 /* unsupported! */
6788                 WARN_ON_ONCE(1);
6789                 status = -EINVAL;
6790                 goto out_server_scope;
6791         }
6792
6793         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6794         trace_nfs4_exchange_id(clp, status);
6795         if (status == 0)
6796                 status = nfs4_check_cl_exchange_flags(res.flags);
6797
6798         if (status == 0)
6799                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6800
6801         if (status == 0) {
6802                 clp->cl_clientid = res.clientid;
6803                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6804                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6805                         clp->cl_seqid = res.seqid;
6806
6807                 kfree(clp->cl_serverowner);
6808                 clp->cl_serverowner = res.server_owner;
6809                 res.server_owner = NULL;
6810
6811                 /* use the most recent implementation id */
6812                 kfree(clp->cl_implid);
6813                 clp->cl_implid = res.impl_id;
6814
6815                 if (clp->cl_serverscope != NULL &&
6816                     !nfs41_same_server_scope(clp->cl_serverscope,
6817                                              res.server_scope)) {
6818                         dprintk("%s: server_scope mismatch detected\n",
6819                                 __func__);
6820                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6821                         kfree(clp->cl_serverscope);
6822                         clp->cl_serverscope = NULL;
6823                 }
6824
6825                 if (clp->cl_serverscope == NULL) {
6826                         clp->cl_serverscope = res.server_scope;
6827                         goto out;
6828                 }
6829         } else
6830                 kfree(res.impl_id);
6831
6832 out_server_owner:
6833         kfree(res.server_owner);
6834 out_server_scope:
6835         kfree(res.server_scope);
6836 out:
6837         if (clp->cl_implid != NULL)
6838                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6839                         "domain: %s, name: %s, date: %llu,%u\n",
6840                         clp->cl_implid->domain, clp->cl_implid->name,
6841                         clp->cl_implid->date.seconds,
6842                         clp->cl_implid->date.nseconds);
6843         dprintk("NFS reply exchange_id: %d\n", status);
6844         return status;
6845 }
6846
6847 /*
6848  * nfs4_proc_exchange_id()
6849  *
6850  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6851  *
6852  * Since the clientid has expired, all compounds using sessions
6853  * associated with the stale clientid will be returning
6854  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6855  * be in some phase of session reset.
6856  *
6857  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6858  */
6859 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6860 {
6861         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6862         int status;
6863
6864         /* try SP4_MACH_CRED if krb5i/p */
6865         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6866             authflavor == RPC_AUTH_GSS_KRB5P) {
6867                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6868                 if (!status)
6869                         return 0;
6870         }
6871
6872         /* try SP4_NONE */
6873         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6874 }
6875
6876 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6877                 struct rpc_cred *cred)
6878 {
6879         struct rpc_message msg = {
6880                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6881                 .rpc_argp = clp,
6882                 .rpc_cred = cred,
6883         };
6884         int status;
6885
6886         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6887         trace_nfs4_destroy_clientid(clp, status);
6888         if (status)
6889                 dprintk("NFS: Got error %d from the server %s on "
6890                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6891         return status;
6892 }
6893
6894 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6895                 struct rpc_cred *cred)
6896 {
6897         unsigned int loop;
6898         int ret;
6899
6900         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6901                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6902                 switch (ret) {
6903                 case -NFS4ERR_DELAY:
6904                 case -NFS4ERR_CLIENTID_BUSY:
6905                         ssleep(1);
6906                         break;
6907                 default:
6908                         return ret;
6909                 }
6910         }
6911         return 0;
6912 }
6913
6914 int nfs4_destroy_clientid(struct nfs_client *clp)
6915 {
6916         struct rpc_cred *cred;
6917         int ret = 0;
6918
6919         if (clp->cl_mvops->minor_version < 1)
6920                 goto out;
6921         if (clp->cl_exchange_flags == 0)
6922                 goto out;
6923         if (clp->cl_preserve_clid)
6924                 goto out;
6925         cred = nfs4_get_clid_cred(clp);
6926         ret = nfs4_proc_destroy_clientid(clp, cred);
6927         if (cred)
6928                 put_rpccred(cred);
6929         switch (ret) {
6930         case 0:
6931         case -NFS4ERR_STALE_CLIENTID:
6932                 clp->cl_exchange_flags = 0;
6933         }
6934 out:
6935         return ret;
6936 }
6937
6938 struct nfs4_get_lease_time_data {
6939         struct nfs4_get_lease_time_args *args;
6940         struct nfs4_get_lease_time_res *res;
6941         struct nfs_client *clp;
6942 };
6943
6944 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6945                                         void *calldata)
6946 {
6947         struct nfs4_get_lease_time_data *data =
6948                         (struct nfs4_get_lease_time_data *)calldata;
6949
6950         dprintk("--> %s\n", __func__);
6951         /* just setup sequence, do not trigger session recovery
6952            since we're invoked within one */
6953         nfs41_setup_sequence(data->clp->cl_session,
6954                         &data->args->la_seq_args,
6955                         &data->res->lr_seq_res,
6956                         task);
6957         dprintk("<-- %s\n", __func__);
6958 }
6959
6960 /*
6961  * Called from nfs4_state_manager thread for session setup, so don't recover
6962  * from sequence operation or clientid errors.
6963  */
6964 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6965 {
6966         struct nfs4_get_lease_time_data *data =
6967                         (struct nfs4_get_lease_time_data *)calldata;
6968
6969         dprintk("--> %s\n", __func__);
6970         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6971                 return;
6972         switch (task->tk_status) {
6973         case -NFS4ERR_DELAY:
6974         case -NFS4ERR_GRACE:
6975                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6976                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6977                 task->tk_status = 0;
6978                 /* fall through */
6979         case -NFS4ERR_RETRY_UNCACHED_REP:
6980                 rpc_restart_call_prepare(task);
6981                 return;
6982         }
6983         dprintk("<-- %s\n", __func__);
6984 }
6985
6986 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6987         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6988         .rpc_call_done = nfs4_get_lease_time_done,
6989 };
6990
6991 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6992 {
6993         struct rpc_task *task;
6994         struct nfs4_get_lease_time_args args;
6995         struct nfs4_get_lease_time_res res = {
6996                 .lr_fsinfo = fsinfo,
6997         };
6998         struct nfs4_get_lease_time_data data = {
6999                 .args = &args,
7000                 .res = &res,
7001                 .clp = clp,
7002         };
7003         struct rpc_message msg = {
7004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7005                 .rpc_argp = &args,
7006                 .rpc_resp = &res,
7007         };
7008         struct rpc_task_setup task_setup = {
7009                 .rpc_client = clp->cl_rpcclient,
7010                 .rpc_message = &msg,
7011                 .callback_ops = &nfs4_get_lease_time_ops,
7012                 .callback_data = &data,
7013                 .flags = RPC_TASK_TIMEOUT,
7014         };
7015         int status;
7016
7017         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7018         nfs4_set_sequence_privileged(&args.la_seq_args);
7019         dprintk("--> %s\n", __func__);
7020         task = rpc_run_task(&task_setup);
7021
7022         if (IS_ERR(task))
7023                 status = PTR_ERR(task);
7024         else {
7025                 status = task->tk_status;
7026                 rpc_put_task(task);
7027         }
7028         dprintk("<-- %s return %d\n", __func__, status);
7029
7030         return status;
7031 }
7032
7033 /*
7034  * Initialize the values to be used by the client in CREATE_SESSION
7035  * If nfs4_init_session set the fore channel request and response sizes,
7036  * use them.
7037  *
7038  * Set the back channel max_resp_sz_cached to zero to force the client to
7039  * always set csa_cachethis to FALSE because the current implementation
7040  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7041  */
7042 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7043 {
7044         unsigned int max_rqst_sz, max_resp_sz;
7045
7046         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7047         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7048
7049         /* Fore channel attributes */
7050         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7051         args->fc_attrs.max_resp_sz = max_resp_sz;
7052         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7053         args->fc_attrs.max_reqs = max_session_slots;
7054
7055         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7056                 "max_ops=%u max_reqs=%u\n",
7057                 __func__,
7058                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7059                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7060
7061         /* Back channel attributes */
7062         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7063         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7064         args->bc_attrs.max_resp_sz_cached = 0;
7065         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7066         args->bc_attrs.max_reqs = 1;
7067
7068         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7069                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7070                 __func__,
7071                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7072                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7073                 args->bc_attrs.max_reqs);
7074 }
7075
7076 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7077 {
7078         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7079         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7080
7081         if (rcvd->max_resp_sz > sent->max_resp_sz)
7082                 return -EINVAL;
7083         /*
7084          * Our requested max_ops is the minimum we need; we're not
7085          * prepared to break up compounds into smaller pieces than that.
7086          * So, no point even trying to continue if the server won't
7087          * cooperate:
7088          */
7089         if (rcvd->max_ops < sent->max_ops)
7090                 return -EINVAL;
7091         if (rcvd->max_reqs == 0)
7092                 return -EINVAL;
7093         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7094                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7095         return 0;
7096 }
7097
7098 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7099 {
7100         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7101         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7102
7103         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7104                 return -EINVAL;
7105         if (rcvd->max_resp_sz < sent->max_resp_sz)
7106                 return -EINVAL;
7107         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7108                 return -EINVAL;
7109         /* These would render the backchannel useless: */
7110         if (rcvd->max_ops != sent->max_ops)
7111                 return -EINVAL;
7112         if (rcvd->max_reqs != sent->max_reqs)
7113                 return -EINVAL;
7114         return 0;
7115 }
7116
7117 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7118                                      struct nfs4_session *session)
7119 {
7120         int ret;
7121
7122         ret = nfs4_verify_fore_channel_attrs(args, session);
7123         if (ret)
7124                 return ret;
7125         return nfs4_verify_back_channel_attrs(args, session);
7126 }
7127
7128 static int _nfs4_proc_create_session(struct nfs_client *clp,
7129                 struct rpc_cred *cred)
7130 {
7131         struct nfs4_session *session = clp->cl_session;
7132         struct nfs41_create_session_args args = {
7133                 .client = clp,
7134                 .cb_program = NFS4_CALLBACK,
7135         };
7136         struct nfs41_create_session_res res = {
7137                 .client = clp,
7138         };
7139         struct rpc_message msg = {
7140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7141                 .rpc_argp = &args,
7142                 .rpc_resp = &res,
7143                 .rpc_cred = cred,
7144         };
7145         int status;
7146
7147         nfs4_init_channel_attrs(&args);
7148         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7149
7150         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7151         trace_nfs4_create_session(clp, status);
7152
7153         if (!status) {
7154                 /* Verify the session's negotiated channel_attrs values */
7155                 status = nfs4_verify_channel_attrs(&args, session);
7156                 /* Increment the clientid slot sequence id */
7157                 clp->cl_seqid++;
7158         }
7159
7160         return status;
7161 }
7162
7163 /*
7164  * Issues a CREATE_SESSION operation to the server.
7165  * It is the responsibility of the caller to verify the session is
7166  * expired before calling this routine.
7167  */
7168 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7169 {
7170         int status;
7171         unsigned *ptr;
7172         struct nfs4_session *session = clp->cl_session;
7173
7174         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7175
7176         status = _nfs4_proc_create_session(clp, cred);
7177         if (status)
7178                 goto out;
7179
7180         /* Init or reset the session slot tables */
7181         status = nfs4_setup_session_slot_tables(session);
7182         dprintk("slot table setup returned %d\n", status);
7183         if (status)
7184                 goto out;
7185
7186         ptr = (unsigned *)&session->sess_id.data[0];
7187         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7188                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7189 out:
7190         dprintk("<-- %s\n", __func__);
7191         return status;
7192 }
7193
7194 /*
7195  * Issue the over-the-wire RPC DESTROY_SESSION.
7196  * The caller must serialize access to this routine.
7197  */
7198 int nfs4_proc_destroy_session(struct nfs4_session *session,
7199                 struct rpc_cred *cred)
7200 {
7201         struct rpc_message msg = {
7202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7203                 .rpc_argp = session,
7204                 .rpc_cred = cred,
7205         };
7206         int status = 0;
7207
7208         dprintk("--> nfs4_proc_destroy_session\n");
7209
7210         /* session is still being setup */
7211         if (session->clp->cl_cons_state != NFS_CS_READY)
7212                 return status;
7213
7214         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7215         trace_nfs4_destroy_session(session->clp, status);
7216
7217         if (status)
7218                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7219                         "Session has been destroyed regardless...\n", status);
7220
7221         dprintk("<-- nfs4_proc_destroy_session\n");
7222         return status;
7223 }
7224
7225 /*
7226  * Renew the cl_session lease.
7227  */
7228 struct nfs4_sequence_data {
7229         struct nfs_client *clp;
7230         struct nfs4_sequence_args args;
7231         struct nfs4_sequence_res res;
7232 };
7233
7234 static void nfs41_sequence_release(void *data)
7235 {
7236         struct nfs4_sequence_data *calldata = data;
7237         struct nfs_client *clp = calldata->clp;
7238
7239         if (atomic_read(&clp->cl_count) > 1)
7240                 nfs4_schedule_state_renewal(clp);
7241         nfs_put_client(clp);
7242         kfree(calldata);
7243 }
7244
7245 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7246 {
7247         switch(task->tk_status) {
7248         case -NFS4ERR_DELAY:
7249                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7250                 return -EAGAIN;
7251         default:
7252                 nfs4_schedule_lease_recovery(clp);
7253         }
7254         return 0;
7255 }
7256
7257 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7258 {
7259         struct nfs4_sequence_data *calldata = data;
7260         struct nfs_client *clp = calldata->clp;
7261
7262         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7263                 return;
7264
7265         trace_nfs4_sequence(clp, task->tk_status);
7266         if (task->tk_status < 0) {
7267                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7268                 if (atomic_read(&clp->cl_count) == 1)
7269                         goto out;
7270
7271                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7272                         rpc_restart_call_prepare(task);
7273                         return;
7274                 }
7275         }
7276         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7277 out:
7278         dprintk("<-- %s\n", __func__);
7279 }
7280
7281 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7282 {
7283         struct nfs4_sequence_data *calldata = data;
7284         struct nfs_client *clp = calldata->clp;
7285         struct nfs4_sequence_args *args;
7286         struct nfs4_sequence_res *res;
7287
7288         args = task->tk_msg.rpc_argp;
7289         res = task->tk_msg.rpc_resp;
7290
7291         nfs41_setup_sequence(clp->cl_session, args, res, task);
7292 }
7293
7294 static const struct rpc_call_ops nfs41_sequence_ops = {
7295         .rpc_call_done = nfs41_sequence_call_done,
7296         .rpc_call_prepare = nfs41_sequence_prepare,
7297         .rpc_release = nfs41_sequence_release,
7298 };
7299
7300 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7301                 struct rpc_cred *cred,
7302                 bool is_privileged)
7303 {
7304         struct nfs4_sequence_data *calldata;
7305         struct rpc_message msg = {
7306                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7307                 .rpc_cred = cred,
7308         };
7309         struct rpc_task_setup task_setup_data = {
7310                 .rpc_client = clp->cl_rpcclient,
7311                 .rpc_message = &msg,
7312                 .callback_ops = &nfs41_sequence_ops,
7313                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7314         };
7315
7316         if (!atomic_inc_not_zero(&clp->cl_count))
7317                 return ERR_PTR(-EIO);
7318         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7319         if (calldata == NULL) {
7320                 nfs_put_client(clp);
7321                 return ERR_PTR(-ENOMEM);
7322         }
7323         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7324         if (is_privileged)
7325                 nfs4_set_sequence_privileged(&calldata->args);
7326         msg.rpc_argp = &calldata->args;
7327         msg.rpc_resp = &calldata->res;
7328         calldata->clp = clp;
7329         task_setup_data.callback_data = calldata;
7330
7331         return rpc_run_task(&task_setup_data);
7332 }
7333
7334 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7335 {
7336         struct rpc_task *task;
7337         int ret = 0;
7338
7339         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7340                 return 0;
7341         task = _nfs41_proc_sequence(clp, cred, false);
7342         if (IS_ERR(task))
7343                 ret = PTR_ERR(task);
7344         else
7345                 rpc_put_task_async(task);
7346         dprintk("<-- %s status=%d\n", __func__, ret);
7347         return ret;
7348 }
7349
7350 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7351 {
7352         struct rpc_task *task;
7353         int ret;
7354
7355         task = _nfs41_proc_sequence(clp, cred, true);
7356         if (IS_ERR(task)) {
7357                 ret = PTR_ERR(task);
7358                 goto out;
7359         }
7360         ret = rpc_wait_for_completion_task(task);
7361         if (!ret) {
7362                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7363
7364                 if (task->tk_status == 0)
7365                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7366                 ret = task->tk_status;
7367         }
7368         rpc_put_task(task);
7369 out:
7370         dprintk("<-- %s status=%d\n", __func__, ret);
7371         return ret;
7372 }
7373
7374 struct nfs4_reclaim_complete_data {
7375         struct nfs_client *clp;
7376         struct nfs41_reclaim_complete_args arg;
7377         struct nfs41_reclaim_complete_res res;
7378 };
7379
7380 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7381 {
7382         struct nfs4_reclaim_complete_data *calldata = data;
7383
7384         nfs41_setup_sequence(calldata->clp->cl_session,
7385                         &calldata->arg.seq_args,
7386                         &calldata->res.seq_res,
7387                         task);
7388 }
7389
7390 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7391 {
7392         switch(task->tk_status) {
7393         case 0:
7394         case -NFS4ERR_COMPLETE_ALREADY:
7395         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7396                 break;
7397         case -NFS4ERR_DELAY:
7398                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7399                 /* fall through */
7400         case -NFS4ERR_RETRY_UNCACHED_REP:
7401                 return -EAGAIN;
7402         default:
7403                 nfs4_schedule_lease_recovery(clp);
7404         }
7405         return 0;
7406 }
7407
7408 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7409 {
7410         struct nfs4_reclaim_complete_data *calldata = data;
7411         struct nfs_client *clp = calldata->clp;
7412         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7413
7414         dprintk("--> %s\n", __func__);
7415         if (!nfs41_sequence_done(task, res))
7416                 return;
7417
7418         trace_nfs4_reclaim_complete(clp, task->tk_status);
7419         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7420                 rpc_restart_call_prepare(task);
7421                 return;
7422         }
7423         dprintk("<-- %s\n", __func__);
7424 }
7425
7426 static void nfs4_free_reclaim_complete_data(void *data)
7427 {
7428         struct nfs4_reclaim_complete_data *calldata = data;
7429
7430         kfree(calldata);
7431 }
7432
7433 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7434         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7435         .rpc_call_done = nfs4_reclaim_complete_done,
7436         .rpc_release = nfs4_free_reclaim_complete_data,
7437 };
7438
7439 /*
7440  * Issue a global reclaim complete.
7441  */
7442 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7443                 struct rpc_cred *cred)
7444 {
7445         struct nfs4_reclaim_complete_data *calldata;
7446         struct rpc_task *task;
7447         struct rpc_message msg = {
7448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7449                 .rpc_cred = cred,
7450         };
7451         struct rpc_task_setup task_setup_data = {
7452                 .rpc_client = clp->cl_rpcclient,
7453                 .rpc_message = &msg,
7454                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7455                 .flags = RPC_TASK_ASYNC,
7456         };
7457         int status = -ENOMEM;
7458
7459         dprintk("--> %s\n", __func__);
7460         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7461         if (calldata == NULL)
7462                 goto out;
7463         calldata->clp = clp;
7464         calldata->arg.one_fs = 0;
7465
7466         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7467         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7468         msg.rpc_argp = &calldata->arg;
7469         msg.rpc_resp = &calldata->res;
7470         task_setup_data.callback_data = calldata;
7471         task = rpc_run_task(&task_setup_data);
7472         if (IS_ERR(task)) {
7473                 status = PTR_ERR(task);
7474                 goto out;
7475         }
7476         status = nfs4_wait_for_completion_rpc_task(task);
7477         if (status == 0)
7478                 status = task->tk_status;
7479         rpc_put_task(task);
7480         return 0;
7481 out:
7482         dprintk("<-- %s status=%d\n", __func__, status);
7483         return status;
7484 }
7485
7486 static void
7487 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7488 {
7489         struct nfs4_layoutget *lgp = calldata;
7490         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7491         struct nfs4_session *session = nfs4_get_session(server);
7492
7493         dprintk("--> %s\n", __func__);
7494         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7495          * right now covering the LAYOUTGET we are about to send.
7496          * However, that is not so catastrophic, and there seems
7497          * to be no way to prevent it completely.
7498          */
7499         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7500                                 &lgp->res.seq_res, task))
7501                 return;
7502         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7503                                           NFS_I(lgp->args.inode)->layout,
7504                                           lgp->args.ctx->state)) {
7505                 rpc_exit(task, NFS4_OK);
7506         }
7507 }
7508
7509 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7510 {
7511         struct nfs4_layoutget *lgp = calldata;
7512         struct inode *inode = lgp->args.inode;
7513         struct nfs_server *server = NFS_SERVER(inode);
7514         struct pnfs_layout_hdr *lo;
7515         struct nfs4_state *state = NULL;
7516         unsigned long timeo, now, giveup;
7517
7518         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7519
7520         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7521                 goto out;
7522
7523         switch (task->tk_status) {
7524         case 0:
7525                 goto out;
7526         /*
7527          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7528          * (or clients) writing to the same RAID stripe
7529          */
7530         case -NFS4ERR_LAYOUTTRYLATER:
7531         /*
7532          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7533          * existing layout before getting a new one).
7534          */
7535         case -NFS4ERR_RECALLCONFLICT:
7536                 timeo = rpc_get_timeout(task->tk_client);
7537                 giveup = lgp->args.timestamp + timeo;
7538                 now = jiffies;
7539                 if (time_after(giveup, now)) {
7540                         unsigned long delay;
7541
7542                         /* Delay for:
7543                          * - Not less then NFS4_POLL_RETRY_MIN.
7544                          * - One last time a jiffie before we give up
7545                          * - exponential backoff (time_now minus start_attempt)
7546                          */
7547                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7548                                     min((giveup - now - 1),
7549                                         now - lgp->args.timestamp));
7550
7551                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7552                                 __func__, delay);
7553                         rpc_delay(task, delay);
7554                         task->tk_status = 0;
7555                         rpc_restart_call_prepare(task);
7556                         goto out; /* Do not call nfs4_async_handle_error() */
7557                 }
7558                 break;
7559         case -NFS4ERR_EXPIRED:
7560         case -NFS4ERR_BAD_STATEID:
7561                 spin_lock(&inode->i_lock);
7562                 lo = NFS_I(inode)->layout;
7563                 if (!lo || list_empty(&lo->plh_segs)) {
7564                         spin_unlock(&inode->i_lock);
7565                         /* If the open stateid was bad, then recover it. */
7566                         state = lgp->args.ctx->state;
7567                 } else {
7568                         LIST_HEAD(head);
7569
7570                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7571                         spin_unlock(&inode->i_lock);
7572                         /* Mark the bad layout state as invalid, then
7573                          * retry using the open stateid. */
7574                         pnfs_free_lseg_list(&head);
7575                 }
7576         }
7577         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7578                 rpc_restart_call_prepare(task);
7579 out:
7580         dprintk("<-- %s\n", __func__);
7581 }
7582
7583 static size_t max_response_pages(struct nfs_server *server)
7584 {
7585         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7586         return nfs_page_array_len(0, max_resp_sz);
7587 }
7588
7589 static void nfs4_free_pages(struct page **pages, size_t size)
7590 {
7591         int i;
7592
7593         if (!pages)
7594                 return;
7595
7596         for (i = 0; i < size; i++) {
7597                 if (!pages[i])
7598                         break;
7599                 __free_page(pages[i]);
7600         }
7601         kfree(pages);
7602 }
7603
7604 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7605 {
7606         struct page **pages;
7607         int i;
7608
7609         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7610         if (!pages) {
7611                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7612                 return NULL;
7613         }
7614
7615         for (i = 0; i < size; i++) {
7616                 pages[i] = alloc_page(gfp_flags);
7617                 if (!pages[i]) {
7618                         dprintk("%s: failed to allocate page\n", __func__);
7619                         nfs4_free_pages(pages, size);
7620                         return NULL;
7621                 }
7622         }
7623
7624         return pages;
7625 }
7626
7627 static void nfs4_layoutget_release(void *calldata)
7628 {
7629         struct nfs4_layoutget *lgp = calldata;
7630         struct inode *inode = lgp->args.inode;
7631         struct nfs_server *server = NFS_SERVER(inode);
7632         size_t max_pages = max_response_pages(server);
7633
7634         dprintk("--> %s\n", __func__);
7635         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7636         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7637         put_nfs_open_context(lgp->args.ctx);
7638         kfree(calldata);
7639         dprintk("<-- %s\n", __func__);
7640 }
7641
7642 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7643         .rpc_call_prepare = nfs4_layoutget_prepare,
7644         .rpc_call_done = nfs4_layoutget_done,
7645         .rpc_release = nfs4_layoutget_release,
7646 };
7647
7648 struct pnfs_layout_segment *
7649 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7650 {
7651         struct inode *inode = lgp->args.inode;
7652         struct nfs_server *server = NFS_SERVER(inode);
7653         size_t max_pages = max_response_pages(server);
7654         struct rpc_task *task;
7655         struct rpc_message msg = {
7656                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7657                 .rpc_argp = &lgp->args,
7658                 .rpc_resp = &lgp->res,
7659                 .rpc_cred = lgp->cred,
7660         };
7661         struct rpc_task_setup task_setup_data = {
7662                 .rpc_client = server->client,
7663                 .rpc_message = &msg,
7664                 .callback_ops = &nfs4_layoutget_call_ops,
7665                 .callback_data = lgp,
7666                 .flags = RPC_TASK_ASYNC,
7667         };
7668         struct pnfs_layout_segment *lseg = NULL;
7669         int status = 0;
7670
7671         dprintk("--> %s\n", __func__);
7672
7673         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7674         if (!lgp->args.layout.pages) {
7675                 nfs4_layoutget_release(lgp);
7676                 return ERR_PTR(-ENOMEM);
7677         }
7678         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7679         lgp->args.timestamp = jiffies;
7680
7681         lgp->res.layoutp = &lgp->args.layout;
7682         lgp->res.seq_res.sr_slot = NULL;
7683         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7684
7685         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7686         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7687
7688         task = rpc_run_task(&task_setup_data);
7689         if (IS_ERR(task))
7690                 return ERR_CAST(task);
7691         status = nfs4_wait_for_completion_rpc_task(task);
7692         if (status == 0)
7693                 status = task->tk_status;
7694         trace_nfs4_layoutget(lgp->args.ctx,
7695                         &lgp->args.range,
7696                         &lgp->res.range,
7697                         status);
7698         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7699         if (status == 0 && lgp->res.layoutp->len)
7700                 lseg = pnfs_layout_process(lgp);
7701         rpc_put_task(task);
7702         dprintk("<-- %s status=%d\n", __func__, status);
7703         if (status)
7704                 return ERR_PTR(status);
7705         return lseg;
7706 }
7707
7708 static void
7709 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7710 {
7711         struct nfs4_layoutreturn *lrp = calldata;
7712
7713         dprintk("--> %s\n", __func__);
7714         nfs41_setup_sequence(lrp->clp->cl_session,
7715                         &lrp->args.seq_args,
7716                         &lrp->res.seq_res,
7717                         task);
7718 }
7719
7720 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7721 {
7722         struct nfs4_layoutreturn *lrp = calldata;
7723         struct nfs_server *server;
7724
7725         dprintk("--> %s\n", __func__);
7726
7727         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7728                 return;
7729
7730         server = NFS_SERVER(lrp->args.inode);
7731         switch (task->tk_status) {
7732         default:
7733                 task->tk_status = 0;
7734         case 0:
7735                 break;
7736         case -NFS4ERR_DELAY:
7737                 if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN)
7738                         break;
7739                 rpc_restart_call_prepare(task);
7740                 return;
7741         }
7742         dprintk("<-- %s\n", __func__);
7743 }
7744
7745 static void nfs4_layoutreturn_release(void *calldata)
7746 {
7747         struct nfs4_layoutreturn *lrp = calldata;
7748         struct pnfs_layout_hdr *lo = lrp->args.layout;
7749
7750         dprintk("--> %s\n", __func__);
7751         spin_lock(&lo->plh_inode->i_lock);
7752         if (lrp->res.lrs_present)
7753                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7754         lo->plh_block_lgets--;
7755         spin_unlock(&lo->plh_inode->i_lock);
7756         pnfs_put_layout_hdr(lrp->args.layout);
7757         kfree(calldata);
7758         dprintk("<-- %s\n", __func__);
7759 }
7760
7761 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7762         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7763         .rpc_call_done = nfs4_layoutreturn_done,
7764         .rpc_release = nfs4_layoutreturn_release,
7765 };
7766
7767 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7768 {
7769         struct rpc_task *task;
7770         struct rpc_message msg = {
7771                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7772                 .rpc_argp = &lrp->args,
7773                 .rpc_resp = &lrp->res,
7774                 .rpc_cred = lrp->cred,
7775         };
7776         struct rpc_task_setup task_setup_data = {
7777                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7778                 .rpc_message = &msg,
7779                 .callback_ops = &nfs4_layoutreturn_call_ops,
7780                 .callback_data = lrp,
7781         };
7782         int status;
7783
7784         dprintk("--> %s\n", __func__);
7785         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7786         task = rpc_run_task(&task_setup_data);
7787         if (IS_ERR(task))
7788                 return PTR_ERR(task);
7789         status = task->tk_status;
7790         trace_nfs4_layoutreturn(lrp->args.inode, status);
7791         dprintk("<-- %s status=%d\n", __func__, status);
7792         rpc_put_task(task);
7793         return status;
7794 }
7795
7796 /*
7797  * Retrieve the list of Data Server devices from the MDS.
7798  */
7799 static int _nfs4_getdevicelist(struct nfs_server *server,
7800                                     const struct nfs_fh *fh,
7801                                     struct pnfs_devicelist *devlist)
7802 {
7803         struct nfs4_getdevicelist_args args = {
7804                 .fh = fh,
7805                 .layoutclass = server->pnfs_curr_ld->id,
7806         };
7807         struct nfs4_getdevicelist_res res = {
7808                 .devlist = devlist,
7809         };
7810         struct rpc_message msg = {
7811                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7812                 .rpc_argp = &args,
7813                 .rpc_resp = &res,
7814         };
7815         int status;
7816
7817         dprintk("--> %s\n", __func__);
7818         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7819                                 &res.seq_res, 0);
7820         dprintk("<-- %s status=%d\n", __func__, status);
7821         return status;
7822 }
7823
7824 int nfs4_proc_getdevicelist(struct nfs_server *server,
7825                             const struct nfs_fh *fh,
7826                             struct pnfs_devicelist *devlist)
7827 {
7828         struct nfs4_exception exception = { };
7829         int err;
7830
7831         do {
7832                 err = nfs4_handle_exception(server,
7833                                 _nfs4_getdevicelist(server, fh, devlist),
7834                                 &exception);
7835         } while (exception.retry);
7836
7837         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7838                 err, devlist->num_devs);
7839
7840         return err;
7841 }
7842 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7843
7844 static int
7845 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7846                 struct pnfs_device *pdev,
7847                 struct rpc_cred *cred)
7848 {
7849         struct nfs4_getdeviceinfo_args args = {
7850                 .pdev = pdev,
7851         };
7852         struct nfs4_getdeviceinfo_res res = {
7853                 .pdev = pdev,
7854         };
7855         struct rpc_message msg = {
7856                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7857                 .rpc_argp = &args,
7858                 .rpc_resp = &res,
7859                 .rpc_cred = cred,
7860         };
7861         int status;
7862
7863         dprintk("--> %s\n", __func__);
7864         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7865         dprintk("<-- %s status=%d\n", __func__, status);
7866
7867         return status;
7868 }
7869
7870 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7871                 struct pnfs_device *pdev,
7872                 struct rpc_cred *cred)
7873 {
7874         struct nfs4_exception exception = { };
7875         int err;
7876
7877         do {
7878                 err = nfs4_handle_exception(server,
7879                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7880                                         &exception);
7881         } while (exception.retry);
7882         return err;
7883 }
7884 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7885
7886 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7887 {
7888         struct nfs4_layoutcommit_data *data = calldata;
7889         struct nfs_server *server = NFS_SERVER(data->args.inode);
7890         struct nfs4_session *session = nfs4_get_session(server);
7891
7892         nfs41_setup_sequence(session,
7893                         &data->args.seq_args,
7894                         &data->res.seq_res,
7895                         task);
7896 }
7897
7898 static void
7899 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7900 {
7901         struct nfs4_layoutcommit_data *data = calldata;
7902         struct nfs_server *server = NFS_SERVER(data->args.inode);
7903
7904         if (!nfs41_sequence_done(task, &data->res.seq_res))
7905                 return;
7906
7907         switch (task->tk_status) { /* Just ignore these failures */
7908         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7909         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7910         case -NFS4ERR_BADLAYOUT:     /* no layout */
7911         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7912                 task->tk_status = 0;
7913         case 0:
7914                 break;
7915         default:
7916                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7917                         rpc_restart_call_prepare(task);
7918                         return;
7919                 }
7920         }
7921 }
7922
7923 static void nfs4_layoutcommit_release(void *calldata)
7924 {
7925         struct nfs4_layoutcommit_data *data = calldata;
7926
7927         pnfs_cleanup_layoutcommit(data);
7928         nfs_post_op_update_inode_force_wcc(data->args.inode,
7929                                            data->res.fattr);
7930         put_rpccred(data->cred);
7931         kfree(data);
7932 }
7933
7934 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7935         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7936         .rpc_call_done = nfs4_layoutcommit_done,
7937         .rpc_release = nfs4_layoutcommit_release,
7938 };
7939
7940 int
7941 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7942 {
7943         struct rpc_message msg = {
7944                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7945                 .rpc_argp = &data->args,
7946                 .rpc_resp = &data->res,
7947                 .rpc_cred = data->cred,
7948         };
7949         struct rpc_task_setup task_setup_data = {
7950                 .task = &data->task,
7951                 .rpc_client = NFS_CLIENT(data->args.inode),
7952                 .rpc_message = &msg,
7953                 .callback_ops = &nfs4_layoutcommit_ops,
7954                 .callback_data = data,
7955                 .flags = RPC_TASK_ASYNC,
7956         };
7957         struct rpc_task *task;
7958         int status = 0;
7959
7960         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7961                 "lbw: %llu inode %lu\n",
7962                 data->task.tk_pid, sync,
7963                 data->args.lastbytewritten,
7964                 data->args.inode->i_ino);
7965
7966         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7967         task = rpc_run_task(&task_setup_data);
7968         if (IS_ERR(task))
7969                 return PTR_ERR(task);
7970         if (sync == false)
7971                 goto out;
7972         status = nfs4_wait_for_completion_rpc_task(task);
7973         if (status != 0)
7974                 goto out;
7975         status = task->tk_status;
7976         trace_nfs4_layoutcommit(data->args.inode, status);
7977 out:
7978         dprintk("%s: status %d\n", __func__, status);
7979         rpc_put_task(task);
7980         return status;
7981 }
7982
7983 /**
7984  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7985  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7986  */
7987 static int
7988 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7989                     struct nfs_fsinfo *info,
7990                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7991 {
7992         struct nfs41_secinfo_no_name_args args = {
7993                 .style = SECINFO_STYLE_CURRENT_FH,
7994         };
7995         struct nfs4_secinfo_res res = {
7996                 .flavors = flavors,
7997         };
7998         struct rpc_message msg = {
7999                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8000                 .rpc_argp = &args,
8001                 .rpc_resp = &res,
8002         };
8003         struct rpc_clnt *clnt = server->client;
8004         struct rpc_cred *cred = NULL;
8005         int status;
8006
8007         if (use_integrity) {
8008                 clnt = server->nfs_client->cl_rpcclient;
8009                 cred = nfs4_get_clid_cred(server->nfs_client);
8010                 msg.rpc_cred = cred;
8011         }
8012
8013         dprintk("--> %s\n", __func__);
8014         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8015                                 &res.seq_res, 0);
8016         dprintk("<-- %s status=%d\n", __func__, status);
8017
8018         if (cred)
8019                 put_rpccred(cred);
8020
8021         return status;
8022 }
8023
8024 static int
8025 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8026                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8027 {
8028         struct nfs4_exception exception = { };
8029         int err;
8030         do {
8031                 /* first try using integrity protection */
8032                 err = -NFS4ERR_WRONGSEC;
8033
8034                 /* try to use integrity protection with machine cred */
8035                 if (_nfs4_is_integrity_protected(server->nfs_client))
8036                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8037                                                           flavors, true);
8038
8039                 /*
8040                  * if unable to use integrity protection, or SECINFO with
8041                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8042                  * disallowed by spec, but exists in deployed servers) use
8043                  * the current filesystem's rpc_client and the user cred.
8044                  */
8045                 if (err == -NFS4ERR_WRONGSEC)
8046                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8047                                                           flavors, false);
8048
8049                 switch (err) {
8050                 case 0:
8051                 case -NFS4ERR_WRONGSEC:
8052                 case -ENOTSUPP:
8053                         goto out;
8054                 default:
8055                         err = nfs4_handle_exception(server, err, &exception);
8056                 }
8057         } while (exception.retry);
8058 out:
8059         return err;
8060 }
8061
8062 static int
8063 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8064                     struct nfs_fsinfo *info)
8065 {
8066         int err;
8067         struct page *page;
8068         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8069         struct nfs4_secinfo_flavors *flavors;
8070         struct nfs4_secinfo4 *secinfo;
8071         int i;
8072
8073         page = alloc_page(GFP_KERNEL);
8074         if (!page) {
8075                 err = -ENOMEM;
8076                 goto out;
8077         }
8078
8079         flavors = page_address(page);
8080         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8081
8082         /*
8083          * Fall back on "guess and check" method if
8084          * the server doesn't support SECINFO_NO_NAME
8085          */
8086         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8087                 err = nfs4_find_root_sec(server, fhandle, info);
8088                 goto out_freepage;
8089         }
8090         if (err)
8091                 goto out_freepage;
8092
8093         for (i = 0; i < flavors->num_flavors; i++) {
8094                 secinfo = &flavors->flavors[i];
8095
8096                 switch (secinfo->flavor) {
8097                 case RPC_AUTH_NULL:
8098                 case RPC_AUTH_UNIX:
8099                 case RPC_AUTH_GSS:
8100                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8101                                         &secinfo->flavor_info);
8102                         break;
8103                 default:
8104                         flavor = RPC_AUTH_MAXFLAVOR;
8105                         break;
8106                 }
8107
8108                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8109                         flavor = RPC_AUTH_MAXFLAVOR;
8110
8111                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8112                         err = nfs4_lookup_root_sec(server, fhandle,
8113                                                    info, flavor);
8114                         if (!err)
8115                                 break;
8116                 }
8117         }
8118
8119         if (flavor == RPC_AUTH_MAXFLAVOR)
8120                 err = -EPERM;
8121
8122 out_freepage:
8123         put_page(page);
8124         if (err == -EACCES)
8125                 return -EPERM;
8126 out:
8127         return err;
8128 }
8129
8130 static int _nfs41_test_stateid(struct nfs_server *server,
8131                 nfs4_stateid *stateid,
8132                 struct rpc_cred *cred)
8133 {
8134         int status;
8135         struct nfs41_test_stateid_args args = {
8136                 .stateid = stateid,
8137         };
8138         struct nfs41_test_stateid_res res;
8139         struct rpc_message msg = {
8140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8141                 .rpc_argp = &args,
8142                 .rpc_resp = &res,
8143                 .rpc_cred = cred,
8144         };
8145         struct rpc_clnt *rpc_client = server->client;
8146
8147         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8148                 &rpc_client, &msg);
8149
8150         dprintk("NFS call  test_stateid %p\n", stateid);
8151         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8152         nfs4_set_sequence_privileged(&args.seq_args);
8153         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8154                         &args.seq_args, &res.seq_res);
8155         if (status != NFS_OK) {
8156                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8157                 return status;
8158         }
8159         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8160         return -res.status;
8161 }
8162
8163 /**
8164  * nfs41_test_stateid - perform a TEST_STATEID operation
8165  *
8166  * @server: server / transport on which to perform the operation
8167  * @stateid: state ID to test
8168  * @cred: credential
8169  *
8170  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8171  * Otherwise a negative NFS4ERR value is returned if the operation
8172  * failed or the state ID is not currently valid.
8173  */
8174 static int nfs41_test_stateid(struct nfs_server *server,
8175                 nfs4_stateid *stateid,
8176                 struct rpc_cred *cred)
8177 {
8178         struct nfs4_exception exception = { };
8179         int err;
8180         do {
8181                 err = _nfs41_test_stateid(server, stateid, cred);
8182                 if (err != -NFS4ERR_DELAY)
8183                         break;
8184                 nfs4_handle_exception(server, err, &exception);
8185         } while (exception.retry);
8186         return err;
8187 }
8188
8189 struct nfs_free_stateid_data {
8190         struct nfs_server *server;
8191         struct nfs41_free_stateid_args args;
8192         struct nfs41_free_stateid_res res;
8193 };
8194
8195 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8196 {
8197         struct nfs_free_stateid_data *data = calldata;
8198         nfs41_setup_sequence(nfs4_get_session(data->server),
8199                         &data->args.seq_args,
8200                         &data->res.seq_res,
8201                         task);
8202 }
8203
8204 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8205 {
8206         struct nfs_free_stateid_data *data = calldata;
8207
8208         nfs41_sequence_done(task, &data->res.seq_res);
8209
8210         switch (task->tk_status) {
8211         case -NFS4ERR_DELAY:
8212                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8213                         rpc_restart_call_prepare(task);
8214         }
8215 }
8216
8217 static void nfs41_free_stateid_release(void *calldata)
8218 {
8219         kfree(calldata);
8220 }
8221
8222 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8223         .rpc_call_prepare = nfs41_free_stateid_prepare,
8224         .rpc_call_done = nfs41_free_stateid_done,
8225         .rpc_release = nfs41_free_stateid_release,
8226 };
8227
8228 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8229                 nfs4_stateid *stateid,
8230                 struct rpc_cred *cred,
8231                 bool privileged)
8232 {
8233         struct rpc_message msg = {
8234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8235                 .rpc_cred = cred,
8236         };
8237         struct rpc_task_setup task_setup = {
8238                 .rpc_client = server->client,
8239                 .rpc_message = &msg,
8240                 .callback_ops = &nfs41_free_stateid_ops,
8241                 .flags = RPC_TASK_ASYNC,
8242         };
8243         struct nfs_free_stateid_data *data;
8244
8245         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8246                 &task_setup.rpc_client, &msg);
8247
8248         dprintk("NFS call  free_stateid %p\n", stateid);
8249         data = kmalloc(sizeof(*data), GFP_NOFS);
8250         if (!data)
8251                 return ERR_PTR(-ENOMEM);
8252         data->server = server;
8253         nfs4_stateid_copy(&data->args.stateid, stateid);
8254
8255         task_setup.callback_data = data;
8256
8257         msg.rpc_argp = &data->args;
8258         msg.rpc_resp = &data->res;
8259         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8260         if (privileged)
8261                 nfs4_set_sequence_privileged(&data->args.seq_args);
8262
8263         return rpc_run_task(&task_setup);
8264 }
8265
8266 /**
8267  * nfs41_free_stateid - perform a FREE_STATEID operation
8268  *
8269  * @server: server / transport on which to perform the operation
8270  * @stateid: state ID to release
8271  * @cred: credential
8272  *
8273  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8274  * negative NFS4ERR value is returned.
8275  */
8276 static int nfs41_free_stateid(struct nfs_server *server,
8277                 nfs4_stateid *stateid,
8278                 struct rpc_cred *cred)
8279 {
8280         struct rpc_task *task;
8281         int ret;
8282
8283         task = _nfs41_free_stateid(server, stateid, cred, true);
8284         if (IS_ERR(task))
8285                 return PTR_ERR(task);
8286         ret = rpc_wait_for_completion_task(task);
8287         if (!ret)
8288                 ret = task->tk_status;
8289         rpc_put_task(task);
8290         return ret;
8291 }
8292
8293 static void
8294 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8295 {
8296         struct rpc_task *task;
8297         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8298
8299         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8300         nfs4_free_lock_state(server, lsp);
8301         if (IS_ERR(task))
8302                 return;
8303         rpc_put_task(task);
8304 }
8305
8306 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8307                 const nfs4_stateid *s2)
8308 {
8309         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8310                 return false;
8311
8312         if (s1->seqid == s2->seqid)
8313                 return true;
8314         if (s1->seqid == 0 || s2->seqid == 0)
8315                 return true;
8316
8317         return false;
8318 }
8319
8320 #endif /* CONFIG_NFS_V4_1 */
8321
8322 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8323                 const nfs4_stateid *s2)
8324 {
8325         return nfs4_stateid_match(s1, s2);
8326 }
8327
8328
8329 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8330         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8331         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8332         .recover_open   = nfs4_open_reclaim,
8333         .recover_lock   = nfs4_lock_reclaim,
8334         .establish_clid = nfs4_init_clientid,
8335         .detect_trunking = nfs40_discover_server_trunking,
8336 };
8337
8338 #if defined(CONFIG_NFS_V4_1)
8339 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8340         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8341         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8342         .recover_open   = nfs4_open_reclaim,
8343         .recover_lock   = nfs4_lock_reclaim,
8344         .establish_clid = nfs41_init_clientid,
8345         .reclaim_complete = nfs41_proc_reclaim_complete,
8346         .detect_trunking = nfs41_discover_server_trunking,
8347 };
8348 #endif /* CONFIG_NFS_V4_1 */
8349
8350 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8351         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8352         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8353         .recover_open   = nfs4_open_expired,
8354         .recover_lock   = nfs4_lock_expired,
8355         .establish_clid = nfs4_init_clientid,
8356 };
8357
8358 #if defined(CONFIG_NFS_V4_1)
8359 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8360         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8361         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8362         .recover_open   = nfs41_open_expired,
8363         .recover_lock   = nfs41_lock_expired,
8364         .establish_clid = nfs41_init_clientid,
8365 };
8366 #endif /* CONFIG_NFS_V4_1 */
8367
8368 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8369         .sched_state_renewal = nfs4_proc_async_renew,
8370         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8371         .renew_lease = nfs4_proc_renew,
8372 };
8373
8374 #if defined(CONFIG_NFS_V4_1)
8375 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8376         .sched_state_renewal = nfs41_proc_async_sequence,
8377         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8378         .renew_lease = nfs4_proc_sequence,
8379 };
8380 #endif
8381
8382 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8383         .get_locations = _nfs40_proc_get_locations,
8384         .fsid_present = _nfs40_proc_fsid_present,
8385 };
8386
8387 #if defined(CONFIG_NFS_V4_1)
8388 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8389         .get_locations = _nfs41_proc_get_locations,
8390         .fsid_present = _nfs41_proc_fsid_present,
8391 };
8392 #endif  /* CONFIG_NFS_V4_1 */
8393
8394 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8395         .minor_version = 0,
8396         .init_caps = NFS_CAP_READDIRPLUS
8397                 | NFS_CAP_ATOMIC_OPEN
8398                 | NFS_CAP_CHANGE_ATTR
8399                 | NFS_CAP_POSIX_LOCK,
8400         .init_client = nfs40_init_client,
8401         .shutdown_client = nfs40_shutdown_client,
8402         .match_stateid = nfs4_match_stateid,
8403         .find_root_sec = nfs4_find_root_sec,
8404         .free_lock_state = nfs4_release_lockowner,
8405         .call_sync_ops = &nfs40_call_sync_ops,
8406         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8407         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8408         .state_renewal_ops = &nfs40_state_renewal_ops,
8409         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8410 };
8411
8412 #if defined(CONFIG_NFS_V4_1)
8413 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8414         .minor_version = 1,
8415         .init_caps = NFS_CAP_READDIRPLUS
8416                 | NFS_CAP_ATOMIC_OPEN
8417                 | NFS_CAP_CHANGE_ATTR
8418                 | NFS_CAP_POSIX_LOCK
8419                 | NFS_CAP_STATEID_NFSV41
8420                 | NFS_CAP_ATOMIC_OPEN_V1,
8421         .init_client = nfs41_init_client,
8422         .shutdown_client = nfs41_shutdown_client,
8423         .match_stateid = nfs41_match_stateid,
8424         .find_root_sec = nfs41_find_root_sec,
8425         .free_lock_state = nfs41_free_lock_state,
8426         .call_sync_ops = &nfs41_call_sync_ops,
8427         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8428         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8429         .state_renewal_ops = &nfs41_state_renewal_ops,
8430         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8431 };
8432 #endif
8433
8434 #if defined(CONFIG_NFS_V4_2)
8435 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8436         .minor_version = 2,
8437         .init_caps = NFS_CAP_READDIRPLUS
8438                 | NFS_CAP_ATOMIC_OPEN
8439                 | NFS_CAP_CHANGE_ATTR
8440                 | NFS_CAP_POSIX_LOCK
8441                 | NFS_CAP_STATEID_NFSV41
8442                 | NFS_CAP_ATOMIC_OPEN_V1,
8443         .init_client = nfs41_init_client,
8444         .shutdown_client = nfs41_shutdown_client,
8445         .match_stateid = nfs41_match_stateid,
8446         .find_root_sec = nfs41_find_root_sec,
8447         .free_lock_state = nfs41_free_lock_state,
8448         .call_sync_ops = &nfs41_call_sync_ops,
8449         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8450         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8451         .state_renewal_ops = &nfs41_state_renewal_ops,
8452 };
8453 #endif
8454
8455 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8456         [0] = &nfs_v4_0_minor_ops,
8457 #if defined(CONFIG_NFS_V4_1)
8458         [1] = &nfs_v4_1_minor_ops,
8459 #endif
8460 #if defined(CONFIG_NFS_V4_2)
8461         [2] = &nfs_v4_2_minor_ops,
8462 #endif
8463 };
8464
8465 static const struct inode_operations nfs4_dir_inode_operations = {
8466         .create         = nfs_create,
8467         .lookup         = nfs_lookup,
8468         .atomic_open    = nfs_atomic_open,
8469         .link           = nfs_link,
8470         .unlink         = nfs_unlink,
8471         .symlink        = nfs_symlink,
8472         .mkdir          = nfs_mkdir,
8473         .rmdir          = nfs_rmdir,
8474         .mknod          = nfs_mknod,
8475         .rename         = nfs_rename,
8476         .permission     = nfs_permission,
8477         .getattr        = nfs_getattr,
8478         .setattr        = nfs_setattr,
8479         .getxattr       = generic_getxattr,
8480         .setxattr       = generic_setxattr,
8481         .listxattr      = generic_listxattr,
8482         .removexattr    = generic_removexattr,
8483 };
8484
8485 static const struct inode_operations nfs4_file_inode_operations = {
8486         .permission     = nfs_permission,
8487         .getattr        = nfs_getattr,
8488         .setattr        = nfs_setattr,
8489         .getxattr       = generic_getxattr,
8490         .setxattr       = generic_setxattr,
8491         .listxattr      = generic_listxattr,
8492         .removexattr    = generic_removexattr,
8493 };
8494
8495 const struct nfs_rpc_ops nfs_v4_clientops = {
8496         .version        = 4,                    /* protocol version */
8497         .dentry_ops     = &nfs4_dentry_operations,
8498         .dir_inode_ops  = &nfs4_dir_inode_operations,
8499         .file_inode_ops = &nfs4_file_inode_operations,
8500         .file_ops       = &nfs4_file_operations,
8501         .getroot        = nfs4_proc_get_root,
8502         .submount       = nfs4_submount,
8503         .try_mount      = nfs4_try_mount,
8504         .getattr        = nfs4_proc_getattr,
8505         .setattr        = nfs4_proc_setattr,
8506         .lookup         = nfs4_proc_lookup,
8507         .access         = nfs4_proc_access,
8508         .readlink       = nfs4_proc_readlink,
8509         .create         = nfs4_proc_create,
8510         .remove         = nfs4_proc_remove,
8511         .unlink_setup   = nfs4_proc_unlink_setup,
8512         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8513         .unlink_done    = nfs4_proc_unlink_done,
8514         .rename_setup   = nfs4_proc_rename_setup,
8515         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8516         .rename_done    = nfs4_proc_rename_done,
8517         .link           = nfs4_proc_link,
8518         .symlink        = nfs4_proc_symlink,
8519         .mkdir          = nfs4_proc_mkdir,
8520         .rmdir          = nfs4_proc_remove,
8521         .readdir        = nfs4_proc_readdir,
8522         .mknod          = nfs4_proc_mknod,
8523         .statfs         = nfs4_proc_statfs,
8524         .fsinfo         = nfs4_proc_fsinfo,
8525         .pathconf       = nfs4_proc_pathconf,
8526         .set_capabilities = nfs4_server_capabilities,
8527         .decode_dirent  = nfs4_decode_dirent,
8528         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8529         .read_setup     = nfs4_proc_read_setup,
8530         .read_done      = nfs4_read_done,
8531         .write_setup    = nfs4_proc_write_setup,
8532         .write_done     = nfs4_write_done,
8533         .commit_setup   = nfs4_proc_commit_setup,
8534         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8535         .commit_done    = nfs4_commit_done,
8536         .lock           = nfs4_proc_lock,
8537         .clear_acl_cache = nfs4_zap_acl_attr,
8538         .close_context  = nfs4_close_context,
8539         .open_context   = nfs4_atomic_open,
8540         .have_delegation = nfs4_have_delegation,
8541         .return_delegation = nfs4_inode_return_delegation,
8542         .alloc_client   = nfs4_alloc_client,
8543         .init_client    = nfs4_init_client,
8544         .free_client    = nfs4_free_client,
8545         .create_server  = nfs4_create_server,
8546         .clone_server   = nfs_clone_server,
8547 };
8548
8549 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8550         .prefix = XATTR_NAME_NFSV4_ACL,
8551         .list   = nfs4_xattr_list_nfs4_acl,
8552         .get    = nfs4_xattr_get_nfs4_acl,
8553         .set    = nfs4_xattr_set_nfs4_acl,
8554 };
8555
8556 const struct xattr_handler *nfs4_xattr_handlers[] = {
8557         &nfs4_xattr_nfs4_acl_handler,
8558 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8559         &nfs4_xattr_nfs4_label_handler,
8560 #endif
8561         NULL
8562 };
8563
8564 /*
8565  * Local variables:
8566  *  c-basic-offset: 8
8567  * End:
8568  */